1 Recording. Solutions. Redefined. OrecX will easily record your VoIP traffic once your VoIP traffic is seen on the server interface. Use (SPAN, port spanning or port monitoring) to get the right traffic to the OrecX server. To understand what is port mirroring?, please see Appendix A (page 6). How to configure There are a few different "" configurations to consider for different types of VoIP networks & different types of VoIP recording needs. In any case 1. be sure your switch supports port mirroring, port spanning or port monitoring functions (whatever term the manufacturer uses for that function). 2. decide which calls need to be recorded.there are three types of calls: Outbound (local phone makes a call to the external phone) Inbound (call is received from the external phone to the local phone) Local or Internal (call is established between two local phones) If recording of local calls is not necessary (or there are no such calls), then a configuration of "" is very simple.you need to mirror the port where is connected to (see Figure 1).
2 Figure 1. Recording of Inbound and Outbound calls only Source Port Destination Port Managed Switch with Mirrored As you can see with Figure 1, RTP audio traffic is sent from IP Phone to. This traffic is mirrored to OrecX server, where it is decoded. This solution works for both inbound and bound calls, but may not work for local calls.
3 On most systems there is an optimization for network bandwidth usage if the call is made between two local/internal, then is sent directly between phones with reaching of (see Figure 2). Figure 2. Recording of Inbound, Outbound & Local/Internal calls Destination Port Source Ports Mirrored In order to record Local calls as well as Inbound and Outbound you must mirror every port where are connected.
4 VoIP Recording Multi-switch network Configuration of " in a multiple switch setup is easy if recording of local calls is not required. In this case "" is required only on the main switch (see Figure 3). Figure 3. Recording of calls on the second switch (no local/internal calls need to be recorded) Source Port Destination Port Regular Switch Mirrored
5 Recording with Multiple Switches & Internal/Local Calls In multi-switch scenarios, where recording of local calls is required there are three configurations: 1. Install additional network adapter into OrecX server and connect multiple switches to it (see Figure 4) 2. Install a separate OrecX server for the second switch (see Figure 5). 3. Use Remote SPAN (RSPAN) capability of Cisco Catalyst Switches (see Figure 6) Figure 4. OrecX server with two network adapters Managed Switch with Mirrored Source Port Destination Port
6 Recording with Multiple Switches & Servers Figure 5. Two OrecX servers 1 2 Mirrored Source Port Destination Port
7 Recording with Multiple Switches & RSPAN Figure 6. RSPAN Configuration Managed Switch with Remote RSPAN Managed Switch with Remote RSPAN Mirrored Source Port Destination Port RSPAN allows you to monitor source ports that are spread all over a switched network, not only locally on a switch with SPAN. This feature appears in CatOS 5.3 in the Catalyst 6500/6000 Series Switches and is added in the Catalyst 4500/4000 Series Switches in CatOS 6.3 and later. The functionality works exactly as a regular SPAN session. The traffic that is monitored by SPAN is not directly copied to the destination port, but flooded into a special RSPAN VLAN. The destination port can then be located anywhere in this RSPAN VLAN. There can even be several destination ports. For More on RSPAN
8 Appendix A What is?, also known as SPAN (Switched Port Analyzer), is a method of monitoring network traffic. With port mirroring enabled, the switch sends a copy of all network packets seen on one port (or an entire VLAN) to another port, where the packet can be analyzed. features, which is supported in nearly all enterprise class switches (managed switches), allows other computers to see a network traffic which is not visible to them in general case. Managed switches have a configuration interface (web-based or command-line console), which administrators may use to specify the source port(s) to be mirrored and the destination port, where copy of all packets will be forwarded. Below pictures illustrate how port mirroring feature works. Four computers (A, B, C and D) are shown on this example. On Figure 2 they are connected to a managed switch with port mirroring support, while on Figure 1 they are connected to a general switch with port mirroring support. A network traffic is sent between computers A and B (one portion of data is sent from A to B and another portion is sent in reverse direction from B to A). In Figure 1 you will see how a general unmanaged switch works. It forwards packets directly between ports, where computers A and B are connected to. Other computers (C and D) do not see these packets. In Figure 2 you will see the same scenario, but on the switch with port mirroring function. The network traffic is sent again between computers A and B. But there is a computer D, which is listening (monitoring) to that traffic. Every packet, which is sent or received by computer A is duplicated (mirrored) to computer D port. When configuring port mirroring on the switch, the "source monitoring port" is a port, where computer A is connected to and the "destination analysis port" is a port, where computer D is connected to. Figure 1. General Switch Figure 2. Managed Switch with General Switch Managed Switch with D Monitored Port (source ) Analysis Port (destination ) A B C D A B C
9 in in RECORDING VoIP TRAFFIC via PORT MIRRORING How function can be used for recording voip calls? OrecX leverages port mirroring capability of a network switch to accomplish "unobtrusive" recording of VoIP calls. The switch forwards to OrecX server a copy of every network packet sent or received by IP phones. Below picture illustrates how the network should be configured to allow a recording of calls. Remote Phones in Telephone Network in in Managed Switch with In this example, one of makes a call to a remote phone side of the local network (whether it is analog phone, cellular or IP Phone). The network traffic from IP Phone goes through a switch and then to. Orecx server receives a copy of every network packet, which is sent or received by IP Phone. in By using intelligent packet capturing technology, OrecX can detect VoIP-related packets inside the network traffic, decode them and save the audio part on a disk.
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