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1 (19) (12) EUROPEAN PATENT SPECIFICATION (11) EP B1 (4) Date of publication and mention of the grant of the patent: Bulletin 12/03 (21) Application number: (22) Date of filing: (1) Int Cl.: H04L 12/66 (06.01) (86) International application number: PCT/US02/ (87) International publication number: WO 03/ ( Gazette 03/) (4) VOICE OVER INTERNET PROTOCOL (VOIP) NETWORK PERFORMANCE MONITOR NETZWERKLEISTUNGSÜBERWACHER FÜR DAS SPRACHE-ÜBER-INTERNET-PROTOKOLL (VOIP) CONTROLEUR DE PERFORMANCE D UN RESEAU DE SYSTEME VOCAL SUR L INTERNET (VOIP) (84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SI SK TR () Priority: US (43) Date of publication of application: Bulletin 0/37 (73) Proprietor: Level 3 Communications, LLC Broomfield, CO (US) (72) Inventors: MITSUMORI, Derek, Hisami Waltham, MA 0243 (US) CHANG, Sujin, Catherine Stow, MA 0177 (US) PAN, Kwang-Shan Acton, MA 0177 (US) (74) Representative: Martin, Philip John et al Marks & Clerk LLP Hills Road Cambridge CB2 1LA (GB) (6) References cited: EP-A WO-A-01/384 WO-A-01/37486 WO-A-01/80492 US-A US-A US-A EP B1 Note: Within nine months of the publication of the mention of the grant of the European patent in the European Patent Bulletin, any person may give notice to the European Patent Office of opposition to that patent, in accordance with the Implementing Regulations. Notice of opposition shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). Printed by Jouve, 7001 PARIS (FR)

2 1 EP B1 2 Description BACKGROUND [0001] The invention relates to a Voice over IP (VoIP) network performance monitor. [0002] Packet-based networks, in particular, VoIP networks, are rapidly emerging as a viable alternative to traditional telephony (that is, circuit switched networks). VoIP is viewed as an attractive option for voice transport in that it allows live voice conversations to be integrated with existing IP data and image applications. To be a truly competitive alternative, VoIP must emulate the performance of traditional telephony and do so using a protocol that was optimized for data traffic. The characteristics of data traffic are quite different from those of voice traffic. [0003] Unlike data traffic, voice traffic is extremely intolerant of delay and delay variation (or "jitter"), as well as, packet loss. Much work has been done in the area of packet delivery to provide end-to-end Quality of Service (QoS). Service level agreements (SLAs) for VoIP, like those for conventional data IP networks, tend to be based on conventional data network metrics - that is, guaranteed service levels are expressed solely in terms of packet level performance, for example, packet loss, jitter, and round-trip delay. [0004] Traditional network performance measurement tools use Packet InterNet Gropers (PINGs) to measure packet loss, jitter and round-trip delay. However, VoIP networks are packet-based networks that transmit data in one-way steady streams of User Datagram Protocol (UDP) packets, which PINGing tools cannot simulate. In addition, traditional network monitoring systems accept performance data that has been averaged over an extended period of time, such as a day or a month. While such measurements are acceptable for data transmissions, which are typically TCP in nature, the real-time nature of VoIP service makes daily and/or monthly averaging of performance results inaccurate in representing a VoIP network user s experience of the service. [000] Examples of prior art arrangements are disclosed in International patent applications Nos. WO01/37486 (Loren Network Management et al) and WO 01/80492 (Telchemy, Inc.) SUMMARY [0006] The invention comprises a method for deriving packet delivery statistics from a User Datagram Protocol (UDP) stream simulating a service level provided by a Voice over Internet Protocol (VoIP) network as set out in claim 1. [0007] A first client terminal connected to the VoIP network generates the UDP stream. In certain embodiments, generating a UDP stream includes selecting a service level and adjusting payload sizes and bit rates of the UDP packets according to the selected service level. [0008] In certain embodiments, the method also includes setting an IP precedence bit to specify a class of service for each UDP packet. [0009] The UDP stream is transmitted by a first client terminal connected to the VoIP network to a second client terminal connected to the VoIP network. The packet delivery statistics are derived from the UDP stream by a first client terminal connected to the VoIP network. [00] In certain embodiments, deriving packet delivery statistics includes measuring packet loss of the UDP stream at each first pre-defined interval. In certain embodiments, deriving packet delivery statistics further includes measuring jitter of the UDP stream at each first pre-defined interval. [0011] In certain embodiments, deriving packet delivery statistics includes measuring round-trip delay of the UDP stream at each first pre-defined interval. The network performance statistics are generated by a monitoring device connected the VoIP network. [0012] The method also includes generating a graphical report showing a distribution of the derived packet delivery statistics over the second pre-defined interval. A first client terminal is connected to a first VoIP Point of Presence (VoIP PoP) on the VoIP network and a second client terminal is connected to a second VoIP PoP on the VoIP network and the method also includes triggering a traceroute that traces a route between the first VoIP PoP and the second VoIP PoP if any one of the network performance statistics exceeds a pre-configured threshold. [0013] According to another aspect of the invention, a Voice over Internet Protocol (VoIP) network performance testing system is defined in claim. [0014] The UDP stream is generated by a first client terminal connected to the VoIP network. [001] In certain embodiments, generating includes controlling the first client terminal to select a service level and generate a UDP stream having payload sizes and bit rates corresponding to the selected service level. [0016] In certain embodiments, system also includes controlling the first client terminal to set an IP precedence bit to specify a class of service for each UDP packet. [0017] In certain embodiments, the system includes controlling the monitoring device to trigger an alarm if any one of the network performance statistics exceeds a pre-configured threshold. [0018] The first client terminal is connected to a first VoIP Point of Presence (VoIP PoP) on the VoIP network and the second client terminal is connected to a second VoIP PoP on the VoIP network, the system also including controlling the monitoring device to trigger a traceroute that traces a route between the first VoIP PoP and the second VoIP PoP if any one of the network performance statistics exceeds a pre-configured threshold. [0019] The system may also include controlling the first client terminal to store results of the traceroute in a traceroute file, wherein the results comprise Internet Protocol (IP) addresses of each router in the route, and send the traceroute file to the monitoring device. [00] Embodiments may have one or more of the fol- 2

3 3 EP B1 4 lowing advantages. The invention enables a VoIP-simulated UDP stream to be generated between every possible pair of VoIP Points of Presence (VoIP PoPs) for use in testing the performance of a VoIP network. The invention generates and reports performance results in a manner that reflects the real-time nature of the VoIP services offered by the VoIP network. With these performance results, a network operator can assess the quality of the VoIP network s services on a daily basis for use with Service Level Agreements, as well as, identify possible problem areas in the VoIP network that may affect performance. [0021] The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims. DESCRIPTION OF DRAWINGS [0022] FIG 1 is a block diagram illustrating a Voice over Internet Protocol (VoIP) network performance test topology. FIG 2 is a flowchart of a process for testing the performance of a VoIP network. FIG 3 shows a sample graphical user interface in accordance with the present invention. [0023] Like reference symbols in the various drawings indicate like elements. DETAILED DESCRIPTION [0024] In one exemplary commercial setting, as shown in FIG 1, a network infrastructure 0 of a VoIP network 2 is maintained by a VoIP network operator (not shown), such as Genuity Inc. of Woburn, MA, and made available to that VoIP network operator s customers (not shown), for example, retail service providers who use the infrastructure and related services of the VoIP network operator to provide VoIP services to end users. In a largescale operation, the network operator supports a large number of VoIP Points of Presence (VoIP PoPs) 4, in different geographic regions for coverage of a larger territory, for example, national level coverage. Each VoIP PoP 4 provides a point of entry to and termination from the VoIP network 2. [002] The network operator monitors the performance of the VoIP network 2 through the use of a VoIPperformance monitor server (or performance monitor server) 6 and VoIP-performance monitor clients (performance monitor clients) 8 deployed at VoIP PoPs 4 throughout the network 2. Each of the performance monitor clients 8 is configured to generate VoIPsimulated UDP streams to others of the performance monitor clients 8 over the VoIP network 2, and perform network parameter and performance measurements (collectively called "performance data"). Preferably, a VoIP-simulated UDP stream is produced by the performance monitor client 8 for each level of service as determined by the type of codec (i.e., coder/decoder) used by a VoIP communications device that is performing the voice encoding and decoding operations at the VoIP PoP 4. In the VoIP PoP 4a shown in FIG 1, a gateway 1 is used to implement one or more coding schemes to support voice encoding/decoding between protocols of the VoIP network 2 and a conventional telephony network, such as a Public Switched Telephone Network (PSTN) 112. [0026] Types of codecs include, but need not be limited to, the following: waveform codecs, source codecs, and hybrid codecs. With waveform codecs, an incoming voice signal is sampled, coded and the coded samples converted to quantized values, which are used to reconstruct the original voice signal. Waveform codecs (e.g., G 711 and G 726) produce high quality sound but consume a significant amount of bandwidth. Source codecs try to match an incoming voice signal to a mathematical model of speech generation. That model is used to reconstruct the original voice signal. The source codec operates at low bit rates but tends to produce poor quality sound. Hybrid codecs (e.g., G 729 and G 723) use some amount of waveform matching as well as knowledge of how the original sound was generated. They tend to provide fairly good quality sound at lower bit rates than waveform codecs. Due to its lower bandwidth requirements, G.729 is the codec of choice for VoIP network performance testing. [0027] FIG. 2 shows a process 0 implemented by the performance monitor server 6 and the performance monitor clients 8. The performance monitor client 8a is configured to generate and transmit (2) a VoIP-simulated UDP stream to every VoIP PoP 4 in the VoIP network 2, including the VoIP PoP 4b having a performance monitor client 8b. In one implementation, the performance monitor client 8a in VoIP PoP 4a is configured to automatically start a new 24-hour testing session, say, for example, every morning after midnight, by generating and transmitting a UDP stream to the performance monitor client 8b in VoIP PoP 4b. The performance monitor client 8a collects (4) samples of raw performance data (e.g., packet loss measurements, jitter measurements, and round-trip delay measurements) on the incoming UDP stream at pre-defined intervals, for example, -second intervals. Thus, each sample contains -seconds worth of data. [0028] The performance monitor server 6 polls (6) the performance monitor client 8a at pre-defined intervals, for example, at 1-minute intervals to gather the samples of raw data. The length of the collection interval and the polling interval may be set at any number that provides a sufficiently large sample size. The performance monitor server 6 can be designed to process (8) each sample s raw data to calculate the average, 3

4 EP B1 6 maximum, and minimum packet loss over the 1-minute period. Similar calculations can be made based on the jitter measurements and the round-trip delay measurements. Once processed, the performance monitor server 6 generates a time stamped 1-minute summary report that includes these calculations, as well as, histograms that show the distribution of the packet loss, jitter, and round-trip delay measurements during that particular 1-minute testing window. It should be noted that the data points used for the calculations and the histograms correspond to the -second samples. The timestamp indicates both the time and date associated with the "start" and "end" of a 1-minute testing window. [0029] In one implementation, the performance monitor server 6 examines (2) the average and maximum values in the 1-minute summary report and triggers (212) an alarm, such as an to an employee of the network operator, if an average value or a maximum value exceeds a configurable threshold. In another implementation, the performance monitor server 6 examines (214) the average and maximum values in the 1- minute summary report and triggers a traceroute between the appropriate VoIP PoP pair (in this case, VoIP PoPs 4a and 4b) if an average value or maximum value exceeds a configurable threshold, or if the percentage of failure events (defined as high packet loss, high jitter, or high round-trip time in the -second sample) during the 1-minute interval exceeds configurable thresholds, such as packet loss which is greater than one percent. These thresholds may be expressed in the format of a Service Level Agreement (SLA) for VoIP services on the VoIP network 2. For example, if the average packet loss value for a UDP stream transmitted by the performance monitor client 8a and received by the performance monitor client 8b exceeds a configurable threshold, the performance monitor server 6 sends a signal to the performance monitor client 8a to trigger a traceroute that traces a route between the VoIP PoP 4a and the VoIP PoP 4b. Since UDP provides no connections but simply delivers packets, it is possible that traffic between the VoIP PoPs 4a and 4b may be sent over more than one route. Over time it is likely that the route between the VoIP PoPs 4a and 4b will vary due to changes in internet connections, modifications of routers, and changes in service. However, over the short term these changes will usually not be present, and a traceroute is a useful tool to test connectivity between the two VoIP PoPs 4a and 4b. At the conclusion of the traceroute, the performance monitor client 8a stores (216) the results of the traceroute - that is, the IP addresses of all the routers along the route between the VoIP PoPs 4a and 4b - in a time stamped traceroute file and sends the traceroute file to the performance monitor server 6. The timestamp indicates what time the traceroute was executed. [00] In one implementation, the network operator monitors the performance (e.g., discard rate, error rate) of the routers in the VoIP network 2 through the use of a router performance monitor server 114. The router performance monitor server 114 may be implemented using commercially available hardware and software. At the conclusion of a traceroute triggered by the performance monitor server 6, the performance monitor server 6 may be configured to establish a link to the router performance monitor server 114 to obtain the performance statistics (e.g., discard rate, error rate) associated with each traceroute hop s router, and store the results of the query in the traceroute file. [0031] The performance monitor server 6 repeats the polling (6) of the performance monitor client 8b at 1-minute intervals until the date associated with the "end" time of the most-recent 1-minute testing window is different from the date associated with the "start" time of the first 1-minute testing window in the 24-hour testing session. When this occurs, the performance monitor server 6 does the following: (1) The performance monitor server 6 processes the raw data collected during the most-recent 1- minute testing window, generates a 1-minute summary report, and triggers a traceroute or alarm, if necessary. (2) The performance monitor server 6 processes all of the raw data collected during the 24-hour testing session to calculate the average, maximum, and minimum packet loss over the 24-hour period. Similar calculations can be made based on the jitter measurements and the round-trip delay measurements. Once processed, the performance monitor server 6 generates a 24-hour summary report that includes these calculations, as well as, histograms that show the distribution of the packet loss, jitter, and round-trip delay measurements per seconds during that 24-hour testing session. By taking the performance measurements at different times of the day over the 24-hour period, the effect of different system loads on the measured quantity can be seen. [0032] In one implementation, each performance monitor client 8 connected to the VoIP network 2 is configured to generate and transmit a VoIP-simulated UDP stream tagged with an IP precedence bit. Setting the IP precedence bit allows the performance monitor server 6 to check the performance of VoIP services when, for example, Quality of Service (QoS) options are configured on the VoIP network 2. In another implementation, each performance monitor client 8 is configured to generate and transmit two VoIP-simulated UDP streams simultaneously - one tagged with an IP precedence bit and one without. The generation and transmission of side-by-side streams permits the performance monitor server 6 to fully compare the relative performance of the VoIP service across different network configurations. In another implementation, each performance monitor client 8 is configured to generate and transmit multiple VoIP-simulated UDP streams, each UDP stream simu- 4

5 7 EP B1 8 lating a different voice codec used by the VoIP service. [0033] A web server 116 connected to the performance monitor server 6 may be configured to display the average, maximum, and minimum values (called "avg/max/min") for packet loss, jitter, and round-trip delay over a 24-hour testing session on a graphical user interface (GUI), a sample of which is shown in FIG 3. The web server 116 may be configured to generate webbased graphical reports that indicate daily packet loss avg/max/min, daily results of the 1-minute histogram reports (e.g., reporting the percent of time in each 1- minute testing window where packet loss was less than or equal to 1%), daily jitter avg/max/min, and daily roundtrip delay avg/max/min. The graphs can be generated for any pair of VoIP PoPs 4 in the VoIP network 2 using the buttons on the left side of the GUI, indicated in dashed lines 2. The buttons on the right side of the GUI, indicated in dashed lines 4, correspond with the 1-minute summary reports that are the basis of the graphed results. If a user wants to examine a particular 1-minute summary report in detail after viewing the graphical results, the user may select a 1-minute Summary Report button by using, for example, a keyboard or a mouse. The web server 116 can display the selected 1-minute Summary Report in the same browser window, or alternatively, generate a new browser window. When a user selects one of the buttons, indicated in dashed lines 6, say, for example, "Max Chicago=>Dallas", the web server 116 highlights the line in the corresponding graph for the UDP stream transmitted from Chicago to Dallas during that particular 24-hour testing session. [0034] Other embodiments are within the scope of the following claims. Claims 1. A method comprising: the method further comprising: triggering a traceroute that traces a route between the first VoIP Point of Presence and the second VoIP Point of Presence if any one of the network performance statistics exceeds a preconfigured threshold; and retrieving router performance statistics of each router in the route between the first VoIP Point of Presence and the second VoIP Point of Presence. 2. The method of claim 1, wherein generating a User Datagram Protocol stream comprises: selecting a service level; and adjusting payload sizes and bit rates of the User Datagram Protocol packets according to the selected service level. 3. The method of claim 2, further comprising: setting an IP precedence bit to specify a class of service for each User Datagram Protocol packet. 4. The method of claim 1, wherein deriving packet delivery statistics comprises at least one of the following: measuring packet loss of the User Datagram Protocol stream at each first pre-defined interval; measuring jitter of the User Datagram Protocol stream at each first pre-defined interval; and measuring round-trip delay of the User Datagram Protocol stream at each first pre-defined interval. deriving packet delivery statistics from a User Datagram Protocol stream simulating a service level provided by a VoIP network and transmitted across the VoIP network (2) by a first client terminal (8a) connected to the VoIP network (2) to a second client terminal (8b) connected to the VoIP network (2), at a first pre-defined interval; and processing the derived packet delivery statistics at a second pre-defined interval to generate network performance statistics for the VoIP network (2), where the second pre-defined interval is substantially larger than the first pre-defined interval wherein the first client terminal (8a) is connected to a first VoIP Point of Presence on the VoIP network (2) and the second client terminal (8b) is connected to a second VoIP Point of Presence on the VoIP network (2), 4 0. The method of claim 1, wherein generating network performance statistics comprises at least one of the following: deriving an average packet loss value of the User Datagram Protocol stream over the second pre-defined interval; deriving a maximum packet loss value of the User Datagram Protocol stream over the second pre-defined interval; deriving a minimum packet loss value of the User Datagram Protocol stream over the second pre-defined interval; deriving an average jitter value of the User Datagram Protocol stream over the second predefined interval; deriving a maximum jitter value of the User Datagram Protocol stream over the second predefined interval;

6 9 EP B1 deriving a minimum jitter value of the User Datagram Protocol stream over the second predefined interval; deriving an average round-trip delay value of the User Datagram Protocol stream over the second pre-defined interval; deriving a maximum round-trip delay value of the User Datagram Protocol stream over the second pre-defined interval; and deriving a minimum round-trip delay value of the User Datagram Protocol stream over the second pre-defined interval. 6. The method of claim 1, further comprising generating a histogram that shows at least one of the following: distribution of measurements for packet loss; distribution of measurements for jitter; and distribution of measurements for delay. 7. The method of claim 1, further comprising: triggering an alarm if any one of the network performance statistics exceeds a pre-configured threshold. 8. The method of claim 1, wherein: the router performance statistics are retrieved from a router performance monitor connected to the VoIP network (2); and/or the router performance statistics comprises discard rates for each router; and/or the router performance statistics comprises error rates for each router. 9. The method of claim 1, wherein the service level is associated with a type of voice codec comprising at least one of the following: a waveform codec; a source codec; and a hybrid codec.. A VoIP network performance testing system (0) comprising: a VoIP network (2); a first client terminal (8a) and a second client terminal (8b), said first and second client terminals connected to the VoIP network (2), each of the first and second client terminals being configured to: generate a stream of User Datagram Protocol packets simulating a service level provided by a VoIP network (2); and transmit the User Datagram Protocol stream across the VoIP network (2) to a client terminal connected to the VoIP network (2), derive packet delivery statistics from an incoming said transmitted UDP stream at a first pre-defined interval; and a monitoring device (6) connected to the VoIP network (2), the monitoring device (6) being configured to: process the derived packet delivery statistics at a second pre-defined interval; and generate network performance statistics for the VoIP network (2), where the second pre-defined interval is substantially larger than the first pre-defined interval, wherein the first client terminal (8a) is connected to a first VoIP Point of Presence on the VoIP network (2) and the second client terminal (8b) is connected to a second VoIP Point of Presence on the VoIP network (2), and the system (0) is configured to: control the monitoring device (6) to trigger a traceroute that traces a route between the first VoIP Point of Presence and the second VoIP Point of Presence if any one of the network performance statistics exceeds a pre-configured threshold; and retrieve router performance statistics of each router in the route between the first VoIP Point of Presence and the second VoIP Point of Presence. 11. The system (0) of claim, configured to: control the monitoring device (6) to trigger an alarm if any one of the network performance statistics exceeds a pre-configured threshold. 12. The system (0) of claim 11, configured to: control the first client terminal (8a) to: store results of the traceroute in a traceroute file, wherein the results comprise Internet Protocol addresses of each router in the route; and send the traceroute file to the monitoring device (6). 13. The system (0) of claim 12, further comprising: a router performance monitor (114) connected to the VoIP network (2), the router performance monitor (114) being configured to poll each router in the route at pre-defined intervals to collect router performance statistics. 6

7 11 EP B1 12 Patentansprüche 1. Verfahren, umfassend: in einem ersten vordefinierten Intervall erfolgendes Ableiten von Paketzustellungsstatistiken Benutzerdatagrammprotokoll-Strom, der ein Dienstniveau simuliert, das durch ein VoIP- Netzwerk bereitgestellt und durch ein erstes mit dem VoIP-Netzwerk (2) verbundenes Client- Endgerät (8a) zu einem zweiten mit dem VoIP-Netzwerk (2) verbundenen Client-Endgerät (8b) übertragen wird; und in einem zweiten vordefinierten Intervall erfolgendes Verarbeiten der abgeleiteten Paketzustellungsstatistiken, um Netzwerkleistungsstatistiken für das VoIP-Netzwerk (2) zu erzeugen, wobei das zweite vordefinierte Intervall wesentlich größer als das erste vordefinierte Intervall ist, wobei das erste Client-Endgerät (8a) mit einem ersten VoIP-Point of Presence im VoIP-Netzwerk (2) verbunden ist und das zweite Client-Endgerät (8b) mit einem zweiten VoIP-Point of Presence im VoIP-Netzwerk (2) verbunden ist, wobei das Verfahren ferner umfasst: Auslösen einer Traceroute, die eine Route zwischen dem ersten VoIP-Point of Presence und dem zweiten VoIP-Point of Presence verfolgt, wenn irgendeine der Netzwerkleistungsstatistiken einen vorkonfigurierten Schwellwert überschreitet; und Abrufen von Routerleistungsstatistiken jedes Routers auf der Route zwischen dem ersten VoIP-Point of Presence und dem zweiten VoIP- Point of Presence. 2. Verfahren nach Anspruch 1, wobei das Erzeugen eines Benutzerdatagrammprotokoll-Stroms umfasst: Auswählen eines Dienstniveaus; und Nachregeln von Nutzlastgrößen und Bitraten der Benutzerdatagrammprotokoll-Pakete entsprechend dem ausgewählten Dienstniveau. 3. Verfahren nach Anspruch 2, ferner umfassend: Setzen eines IP-Präzedenzbits, um eine Dienstklasse für jedes Benutzerdatagrammprotokoll- Paket festzulegen. 4. Verfahren nach Anspruch 1, wobei das Ableiten von Paketzustellungsstatistiken mindestens eines von folgendem umfasst: Messen des Paketverlusts des Benutzerdatagrammprotokoll-Stroms in jedem ersten vordefinierten Intervall; Messen des Jitters des Benutzerdatagrammprotokoll-Stroms in jedem ersten vordefinierten Intervall; und Messen der Umlaufverzögerung des Benutzerdatagrammprotokoll-Stroms in jedem ersten vordefinierten Intervall.. Verfahren nach Anspruch 1, wobei das Erzeugen von Netzwerkleistungsstatistiken mindestens eines von folgendem umfasst: Ableiten eines durchschnittlichen Paketverlustwerts des Benutzerdatagrammprotokoll-Stroms über das zweite vordefinierte Intervall; Ableiten eines maximalen Paketverlustwerts des Benutzerdatagrammprotokoll-Stroms über das zweite vordefinierte Intervall; Ableiten eines minimalen Paketverlustwerts des Benutzerdatagrammprotokoll-Stroms über das zweite vordefinierte Intervall; Ableiten eines durchschnittlichen Jitterwerts des Benutzerdatagrammprotokoll-Stroms über das zweite vordefinierte Intervall; Ableiten eines maximalen Jitterwerts des Benutzerdatagrammprotokoll-Stroms über das zweite vordefinierte Intervall; Ableiten eines minimalen Jitterwerts des Benutzerdatagrammprotokoll-Stroms über das zweite vordefinierte Intervall; Ableiten eines durchschnittlichen Umlaufverzögerungswerts des Benutzerdatagrammprotokoll-Stroms über das zweite vordefinierte Intervall; Ableiten eines maximalen Umlaufverzögerungswerts des Benutzerdatagrammprotokoll- Stroms über das zweite vordefinierte Intervall; und Ableiten eines minimalen Umlaufverzögerungswerts des Benutzerdatagrammprotokoll-Stroms über das zweite vordefinierte Intervall. 6. Verfahren nach Anspruch 1, ferner umfassend: Erzeugen eines Histogramms, das mindestens eines von folgendem zeigt: Verteilung der Messungen für Paketverlust; Verteilung der Messungen für Jitter; und Verteilung der Messungen für Verzögerung. 7. Verfahren nach Anspruch 1, ferner umfassend: Auslösen eines Alarms, wenn irgendeine der Netzwerkleistungsstatistiken einen vorkonfigurierten Schwellwert überschreitet. 7

8 13 EP B Verfahren nach Anspruch 1, wobei: die Routerleistungsstatistiken von einer Routerleistungsüberwachungseinrichtung abgerufen werden, die mit dem VoIP-Netzwerk (2) verbunden ist; und/oder die Routerleistungsstatistiken Wegwerfraten für jeden Router umfassen; und/oder die Routerleistungsstatistiken Fehlerraten für jeden Router umfassen. 9. Verfahren nach Anspruch 1, wobei das Dienstniveau einem Typ von Sprachcodec zugeordnet ist, der mindestens eines von folgendem umfasst: ein Wellenform-Codec; ein Quellen-Codec; und ein Hybrid-Codec.. VoIP-Netzwerkleistungsprüfungssystem (0), umfassend: 1 Point of Presence im VoIP-Netzwerk (2) verbunden ist, und wobei das System konfiguriert ist zum: Steuern der Überwachungsvorrichtung (6), um eine Traceroute auszulösen, die eine Route zwischen dem ersten VoIP-Point of Presence und dem zweiten VoIP-Point of Presence verfolgt, wenn irgendeine der Netzwerkleistungsstatistiken einen vorkonfigurierten Schwellwert überschreitet; und Abrufen von Routerleistungsstatistiken jedes Routers auf der Route zwischen dem ersten VoIP-Point of Presence und dem zweiten VoIP- Point of Presence. 11. System (0) nach Anspruch, konfiguriert zum: Steuern der Überwachungsvorrichtung (6), um einen Alarm auszulösen, wenn irgendeine der Netzwerkleistungsstatistiken einen vorkonfigurierten Schwellwert überschreitet. ein VoIP-Netzwerk (2); ein erstes Client-Endgerät (8a) und ein zweites Client-Endgerät (8b), wobei die ersten und zweiten Client-Endgeräte mit dem VoIP- Netzwerk (2) verbunden sind, wobei jedes der ersten und zweiten Client-Endgeräte konfiguriert ist zum: Erzeugen eines Stroms von Benutzerdatagrammprotokoll-Paketen, der ein Dienstniveau simuliert, das durch ein VoIP-Netzwerk (2) bereitgestellt wird; Übertragen des Benutzerdatagrammprotokoll-Stroms über das VoIP-Netzwerk (2) zu einem Client-Endgerät, das mit dem VoIP-Netzwerk (2) verbunden ist; und Ableiten von Paketzustellungsstatistiken aus einem ankommenden besagten übertragenen UDP-Strom in einem ersten vordefinierten Intervall; und System (0) nach Anspruch 11, konfiguriert zum: Steuern des ersten Client-Endgeräts (8a) zum: Speichern von Ergebnissen der Traceroute in einer Traceroute-Datei, wobei die Ergebnisse Internetprotokolladressen jedes Routers auf der Route umfassen; und Senden der Traceroute-Datei an die Überwachungsvorrichtung (6). 13. System (0) nach Anspruch 12, ferner umfassend: eine Routerleistungsüberwachungseinrichtung (114), die mit dem VoIP-Netzwerk (2) verbunden ist, wobei die Routerleistungsüberwachungseinrichtung (114) dafür konfiguriert ist, jeden Router auf der Route in vordefinierten Intervallen abzufragen, um Routerleistungsstatistiken zu sammeln. eine Überwachungsvorrichtung (6), die mit dem VoIP-Netzwerk (2) verbunden ist, wobei die Überwachungsvorrichtung (6) konfiguriert ist zum: Verarbeiten der abgeleiteten Paketzustellungsstatistiken in einem zweiten vordefinierten Intervall; und Erzeugen von Netzwerkleistungsstatistiken für das VoIP-Netzwerk (2), wobei das zweite vordefinierte Intervall wesentlich größer als das erste vordefinierte Intervall ist, wobei das erste Client-Endgerät (8a) mit einem ersten VoIP-Point of Presence im VoIP- Netzwerk (2) verbunden ist und das zweite Client-Endgerät (8b) mit einem zweiten VoIP- 4 0 Revendications 1. Procédé comprenant les étapes ci-dessous consistant à : dériver des statistiques de remises de paquets à partir d un flux de protocoles de service de datagramme d utilisateur simulant un niveau de service fourni par un réseau VoIP et transmis à travers le réseau VoIP (2), par un premier terminal de système client (8a) connecté au réseau VoIP (2), à un second terminal de système client (8b) connecté au réseau VoIP (2), au cours d un premier intervalle 8

9 1 EP B1 16 prédéfini ; et traiter les statistiques de remises de paquets dérivées au cours d un second intervalle prédéfini, en vue de générer des statistiques de performances de réseau pour le réseau VoIP (2), où le second intervalle prédéfini est sensiblement supérieur au premier intervalle prédéfini ; dans lequel le premier terminal de système client (8a) est connecté à un premier point de présence VoIP sur le réseau VoIP (2) et le second terminal de système client (1 08b) est connecté à un second point de présence VoIP sur le réseau VoIP (2) ; le procédé comprenant en outre les étapes cidessous consistant à : déclencher un utilitaire Traceroute qui trace un chemin entre le premier point de présence VoIP et le second point de présence VoIP si l une quelconque des statistiques de performances de réseau dépasse un seuil préconfiguré ; et récupérer des statistiques de performances de routeur de chaque routeur sur le chemin entre le premier point de présence VoIP et le second point de présence VoIP. 2. Procédé selon la revendication 1, dans lequel l étape consistant à générer un flux de protocoles de service de datagramme d utilisateur comprend les étapes ci-dessous consistant à : sélectionner un niveau de service ; et ajuster des tailles de charge utile et des débits binaires des paquets de protocole de service de datagramme d utilisateur selon le niveau de service sélectionné. 3. Procédé selon la revendication 2, comprenant en outre l étape ci-dessous consistant à : définir un bit de priorité IP en vue de spécifier une classe de service pour chaque paquet de protocole de service de datagramme d utilisateur. 4. Procédé selon la revendication 1, dans lequel l étape consistant à dériver des statistiques de remises de paquets comprend au moins l une des étapes ci-dessous consistant à : mesurer une perte de paquets du flux de protocoles de service de datagramme d utilisateur à chaque premier intervalle prédéfini ; mesurer une gigue du flux de protocoles de service de datagramme d utilisateur à chaque premier intervalle prédéfini ; et mesurer un temps de propagation aller et retour du flux de protocoles de service de datagramme d utilisateur à chaque premier intervalle prédéfini.. Procédé selon la revendication 1, dans lequel l étape consistant à générer des statistiques de performances de réseau comprend au moins l une des étapes ci-dessous consistant à : dériver une valeur moyenne de perte de paquets du flux de protocoles de service de datagramme d utilisateur au cours du second intervalle prédéfini ; dériver une valeur maximale de perte de paquets du flux de protocoles de service de datagramme d utilisateur au cours du second intervalle prédéfini ; dériver une valeur minimale de perte de paquets du flux de protocoles de service de datagramme d utilisateur au cours du second intervalle prédéfini ; dériver une valeur moyenne de gigue du flux de protocoles de service de datagramme d utilisateur au cours du second intervalle prédéfini ; dériver une valeur maximale de gigue du flux de protocoles de service de datagramme d utilisateur au cours du second intervalle prédéfini ; dériver une valeur minimale de gigue du flux de protocoles de service de datagramme d utilisateur au cours du second intervalle prédéfini ; dériver une valeur moyenne de temps de propagation aller et retour du flux de protocoles de service de datagramme d utilisateur au cours du second intervalle prédéfini ; dériver une valeur maximale de temps de propagation aller et retour du flux de protocoles de service de datagramme d utilisateur au cours du second intervalle prédéfini ; et dériver une valeur minimale de temps de propagation aller et retour du flux de protocoles de service de datagramme d utilisateur au cours du second intervalle prédéfini. 6. Procédé selon la revendication 1, comprenant en outre l étape consistant à générer un histogramme qui indique au moins l une des distributions cidessous : une distribution de mesures pour une perte de paquets ; une distribution de mesures pour une gigue ; et une distribution de mesures pour un temps de propagation. 7. Procédé selon la revendication 1, comprenant en outre l étape ci-dessous consistant à : déclencher une alarme si l une quelconque des statistiques de performances de réseau dépas- 9

10 17 EP B1 18 se un seuil préconfiguré. 8. Procédé selon la revendication 1, dans lequel : les statistiques de performances de routeur sont récupérées à partir d un moniteur de performances de routeur connecté au réseau VoIP (2) ; et/ou les statistiques de performances de routeur comportent des taux de rejet pour chaque routeur ; et/ou les statistiques de performances de routeur comportent des taux d erreur pour chaque routeur. 9. Procédé selon la revendication 1, dans lequel le niveau de service est associé à un type de codec vocal comprenant au moins l un des éléments ci-dessous : un codec de forme d onde ; un codec source ; et un codec hybride.. Système de test de performance de réseau VoIP (0) comprenant : un réseau VoIP (2) ; un premier terminal de système client (8a) et un second terminal de système client (8b), lesdits premier et second terminaux de systèmes clients étant connectés au réseau VoIP (2), chacun des premier et second terminaux de systèmes clients étant configuré de manière à: générer un flux de paquets de protocoles de service de datagramme d utilisateur simulant un niveau de service fourni par un réseau VoIP (2) ; et transmettre le flux de protocoles de service de datagramme d utilisateur à travers le réseau VoIP (2) à un terminal de système client connecté au réseau VoIP (2) ; dériver des statistiques de remises de paquets à partir d un flux de protocoles UDP entrant transmis au cours d un premier intervalle prédéfini ; et un dispositif de surveillance (6) connecté au réseau VoIP (2), le dispositif de surveillance (6) étant configuré de manière à : traiter les statistiques de remises de paquets dérivées au cours d un second intervalle prédéfini ; et générer des statistiques de performances de réseau pour le réseau VoIP (2), où le second intervalle prédéfini est sensiblement supérieur au premier intervalle prédéfini ; dans lequel le premier terminal de système client (8a) est connecté à un premier point de présence VoIP sur le réseau VoIP (2) et le second terminal de système client (8b) est connecté à un second point de présence VoIP sur le réseau VoIP (2) ; et le système (0) est configuré de manière à : commander au dispositif de surveillance (6) de déclencher un utilitaire Traceroute qui trace un chemin entre le premier point de présence VoIP et le second point de présence VoIP si l une quelconque des statistiques de performances de réseau dépasse un seuil préconfiguré ; et récupérer des statistiques de performances de routeur de chaque routeur sur le chemin entre le premier point de présence VoIP et le second point de présence VoIP. 11. Système (0) selon la revendication, configuré de manière à : commander au dispositif de surveillance (6) de déclencher une alarme si l une quelconque des statistiques de performances de réseau dépasse un seuil préconfiguré. 12. Système (0) selon la revendication 11, configuré de manière à : commander au premier terminal de système client (8a) de : stocker les résultats de l utilitaire Traceroute dans un fichier d utilitaire Traceroute, dans lequel les résultats comprennent des adresses IP de chaque routeur sur le chemin ; et envoyer le fichier d utilitaire Traceroute au dispositif de surveillance (6). 13. Système (0) selon la revendication 12, comprenant en outre : un moniteur de performances de routeur (114) connecté au réseau VoIP (2), le moniteur de performances de routeur (114) étant configuré de manière à interroger chaque routeur sur le chemin à des intervalles prédéfinis en vue de recueillir des statistiques de performances de routeur.

11 EP B1 11

12 EP B1 12

13 EP B1 13

14 EP B1 REFERENCES CITED IN THE DESCRIPTION This list of references cited by the applicant is for the reader s convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard. Patent documents cited in the description WO A [000] WO A [000] 14

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