IP TELEPHONY DCT2000 TEST SOLUTIONS. Focus on Digital Telecom Test

Transcription

1 TELEPHONY DCT2000 TEST SOLUTIONS Focus on Digital Telecom Test

2 Telephony Challenges The telecommunications industry has experienced a marked proliferation of -based networks. This phenomenal growth in the sector has reshaped the future of voice traffic, encouraged the integration of multimedia and led to the evolution of Telephony. The rise of Telephony signals the migration of voice traffic from traditional circuit-switched networks to packet-switched networks. The Benefits of Telephony Telephony eliminates the cost of maintaining multiple networks each dedicated to the traffic of a single medium. By utilizing as a common transport layer, networks dedicated to voice, video, and data effectively merge into a single unified network. As legacy circuit-switched networks are integrated with emerging packet-switched networks, an open and scalable multimedia infrastructure emerges. Today s businesses employ Telephony networks to reduce costs as well as to broaden the means of communication. Communication across networks has been elevated from simple Web and access to multimedia conferencing sessions and real-time document collaboration. As a wealth of features available with circuit switched voice systems are added to future Internet Telephony products and services, international and domestic callers alike will turn to Telephony providers for an integrated solution. This integration across network environments increases reliability and interoperability while offering greater economies of scale. The Challenges of Telephony In a packet-switched network, real-time streaming data such as voice and video are compressed into packetized data and sent out over physical links to be reassembled and re-sequenced on the other end. This process results in an effective use of network bandwidth. In order to deliver high quality voice solutions, Telephony incorporates families of multimedia specifications. A major challenge is the explosion in specifications. Today s telecommunications standards bodies have numerous standing committees dedicated to delivering voice-overpacket solutions. The dominant Telephony standards are and, which have been published by the International Telecommunication Union (ITU) and the Internet Engineering Task Force (IETF) respectively. standards include the protocol suite,, and /RTCP while standards include, /RTCP, H.428/Megaco and other networking protocols. Meanwhile, manufacturers and providers attempt to rapidly produce and deploy Telephony products and services to the market even as the standards continue to evolve. To be successful, manufacturers must ensure that new products and services are able to interwork with other networks such as PSTN and Cellular networks. Therefore, Telephony products must undergo comprehensive testing to verify conformance to interworking protocols (such as -T, SIGTRAN and BICC).

3 Catapult Telephony Test Solutions Catapult has been meeting the testing needs of the telecommunications industry since With long-term expertise in building test solutions for cellular, SS7 and other networks, Catapult offers a broad range of solutions to help solve the most demanding Telephony test challenges. The Catapult DCT2000 Digital Communications Test System provides a powerful and versatile platform allowing developers to test almost any and network nodes. A Powerful Platform Leveraging the strengths of a UNIX -based workstation and the power of Catapult PowerPCI cards, the DCT2000 offers a multi-user testing environment. This accessibility enables all members of a test group to simultaneously test a given product. DCT2000 users have the option of running their Internet Telephony tests over the workstation sockets or the Catapult Power- PCI Ethernet cards. The multi-port capability of the DCT2000 allows multiple-protocol testing on a single system. As a result, the DCT2000 can simulate and monitor multiple nodes in the Telephony network simultaneously. Catapult customers can test almost any or network node, such as a, Gatekeeper, Multi-point Control Unit (MCU), Signaling, Media, Media Controller (MGC), Call Agent and Terminal Equipment. The modular architecture of the DCT2000 delivers a powerful platform that can be adapted to evolving test needs. A Versatile Platform The DCT2000 supports standards including the protocol suite, and /RTCP protocols. The DCT2000 also supports standards including, /RTCP and H.248/Megaco. Additionally, the DCT2000 supports the inter-working protocols between telephony and PSTN/Cellular networks, including -T, SIGTRAN (M3UA, M2PA, SUA,, etc.) and BICC (CS1 and CS2) protocols. Supporting over 200 protocol and variant modules, the DCT2000 provides the encoders, decoders and underlying state machines for testing Telephony, 3G (UMTS and cdma2000), GPRS, SS7, ISDN, QSIG, V5 and many more. The DCT2000 delivers an expandable and comprehensive telecom test solution that can reduce product development time and costs. DCT2000 Test Applications The DCT2000 supports a number of applications that span the product life cycle from initial development to final deployment in the field. Customers can utilize the DCT2000 to perform the following applications: Design and Feature Verification Conformance Testing Interoperability Testing Load and Stress Testing Installation and Acceptance Testing Throughout product development and various testing cycles, expert Catapult Customer Application Engineers (CAEs) provide world-class support for the DCT2000 test system. The DCT2000 is multi-user, multi-protocol, programmable test system that can reduce product development time and costs. PowerPCI cards can run multiple protocols, providing a scalable solution that is not limited by workstation performance. 1

4 Alerting Connect Telephony Network Infrastructure Internet Telephony delivers a flexible network infrastructure for transmitting voice calls across the integrated and traditional voice networks. Depending on the call scenario, various network nodes and Telephony protocols may be employed. Ca Catapult Supported Telephony Protocols * Protocol Spec Function Signaling Encoder/Decoder H.245 ITU-T Call Control H CS ITU-T Call Signaling H RAS ITU-T Registration, Admission and Status H.235 ITU-T Security and Encryption H.450 ITU-T Supplementary Services Annex E Encoder/Decoder/S.M. ITU-T Multiplexed Call Signaling Transport Encoder/Decoder IETF Media Services Encoder/Decoder IETF Session Initiation -T Encoder/Decoder IETF Session Initiation for telephone Encoder/Decoder IETF Transport functions for real-time data RTCP Encoder/Decoder IETF Control of Communication H.248 (Megaco) Encoder/Decoder IETF Control v6 & v4 Encoder/Decoder/S.M. IETF Protocol Encoder/Decoder IETF Stream Control Transmission Protocol M2PA Encoder/Decoder IETF MTP2 Peer-to-Peer Adaptation M3UA Encoder/Decoder/S.M. IETF MTP3 User Adaptation SUA Encoder/Decoder IETF SCCP User Adaptation BICC Encoder/Decoder ITU-T Bearer Independent Call Control CALL FLOW 1: To PSTN/Cellular Networks H RAS Messages Q.931 (H.225.0) Call Signalling Messages To PSTN/Cellular Networks Signaling Network Ga 3 * Contact Catapult Communications for the most current listing of supported telephony specifications. Network Key Abbrev. Network Node MCU MGC Multipoint Control Unit Media Controller TE PC Terminal Equipment Personal Computer 2

5 To PSTN/Cellular Networks ENDPOINT 1 ENDPOINT 2 GATEKEEPER Admission Request Admission Confirmed ll Proceeding Admission Request Setup Admission Confirmed To PSTN/Cellular Networks Gatekeeper Gatekeeper MCU Network CALL FLOW 2: AND - Caller Off-Hook Dialing RGW AGENT RQNT NOTIFY ACK 200 RQNT CALL AGENT Soft Switch NOTIFY ACK 200 CRCX+RQNT Media teway Ringing RQNT SIGTRAN 31 H.248 (MEGACO) Agent 33 Free Dial Tone Connection Hang Up MDCX+RQNT NOTIFY ACK 200 DLCX+RQNT resp. 200 resp. 180 resp. 200 ACK INVITE Ring Callee Off Hook Caller Heard 4 Residential Abbrev. Request Example Acknowledgment OK ACK Acknowledgement ACK info@catapult.com /2.0 BYE BYE BYE sip:info@catapult.com /2.0 CRCX Create Connection CRCX 1204 person@rgw-1.catapult.jp.co 1.0 DLCX Delete Connection DLCX 1210 person@rgw-1.catapult.jp.co 1.0 Invite Invitation INVITE sip:info@catapult.com /2.0 MDCX Modify Connection MDCX 1209 person@rgw-1.catapult.jp.co 1.0 NOTIFY Notify Call Agent NTFY 2005 person@rgw-1.catapult.jp.co 1.0 RQNT Request Notification RQNT 1206 person@rgw-1.catapult.jp.co 1.0 resp.xxx Acceptation Message / OK BYE MGC MGC SIGTRAN -T -Based Database (e.g. HLR) 35 BICC 33 Free Dial Tone Residential Network H RASH Call Signaling H.245 Control Signaling UDP TCP RTCP /-T UDP TCP UDP H.248 UDP H.248/MEGACO /-T UDP RANAP RNSAP TCAP ISUP SCCP M3UA M3UA TUP ISDN QSIG TCAP RANAP RNSAP IUA SUA IUA SUA SIGTRAN RANAP RNSAP TCAP ISUP SCCP TUP MTP3 M2PA M2UA M3UA VUA VUA MTP3 MTP2 MTP1 STCMTP, MTP-3b & M3UA MTP-3b M2PA SSCF SSCOP AAL5 ATM BICC STCSSCOP M3UA SSCOP SSCOPMCE BICC AAL5 ATM STC

6 DCT2000 Telephony Test Applications In addition to supporting communications within and networks, Telephony also allows the inter-working between these networks and PSTN/Cellular networks. Manufacturers and service providers may demand diverse types of Telephony applications. PSTN/Cellular TE TE TE Network Origination Termination TE TE TE TE TE PSTN/Cellular Origination Termination Origination PSTN/Cellular Termination PSTN/Cellular Origination -PSTN/Cellular Termination Network PSTN/Cellular DCT2000 PBX Media SIGTRAN H.248/Megaco MGC DUT DCT2000 INTEROPERABILITY TESTING With the flexibility of the DCT2000 test platform, a manufacturer is able to perform both load and stress testing on a combined Gatekeeper/ product. DCT QSIG DCT H225RAS H245 PBX DCT H225CS QSIG Gatekeeper DUT DCT LOAD AND STRESS TESTING H225RAS Utilizing the DCT2000 to simulate both a and PBX, a manufacturer is able to successfully verify features, functionality and interoperabilty of Gatekeeper and products. Customer s Device Under Test Simulated on DCT2000 DCT2000 Application: Interoperability Testing within an Telephony Network A manufacturer wants to verify the interoperability of an and a Gatekeeper. The testing requires the devices under test to inter-work with other network devices: a PBX (Private Branch exchanges) and an. The manufacturer wants to avoid incurring the expense of procuring the external and PBX and turns to Catapult for a testing solution. To perform this interoperability testing, a single DCT2000 is used to simulate the required network devices. By simulating the PBX, the DCT2000 emulates QSIG (Q reference SIGnaling) protocol to act as a real PBX. By simulating the, the DCT2000 also emulates the protocol suite, including H CS for call setup, H RAS for call registration, admission and status report and H.245 for control signaling. Meanwhile, the DCT2000 supports (Real Time Transport Protocol) and RTCP (Real Time Transport Control Protocol) to handle the traffic. Additionally, the multi-user access capability of the DCT2000 eliminates the need to purchase multiple test systems. DCT2000 Application: Load and Stress Testing within a Telephony Network A manufacturer is developing a Media Controller (MGC). The manufacturer wants to verify the MGC s performance under heavy traffic. The simulated environment should include a Agent, a Signaling and a Media. The manufacturer decides to purchase a Catapult DCT2000 to perform the Load and Stress testing. The DCT2000 provides the simulation functions of the required network devices in a single platform. The DCT2000 generates the desired message traffic, including signaling for session establishment, H.248/Megaco media gateway control signaling and SIGTRAN (SIGnaling TRANsport) signaling for SS7 over. Under different load levels, the manufacturer can verify the performance of the MGC under test. Specifically, the DCT2000 can generate the extreme signaling load to the MGC under test to see how this MGC will respond. With the DCT2000, the manufacturer can be confident that the MGC under heavy traffic performs exactly as expected. 4

7 DCT2000 Test Implementations The DCT2000 supports test applications that span the entire product life cycle from initial development to final deployment. The flexibility of the DCT2000 permits the implementation of numerous test scenarios. During the initial stages of development, developers can use the DCT2000 to perform design and feature verification as well as conformance testing. As the product evolves, the DCT2000 can be used for interoperability testing as well as stress and load testing. In the final stages of development, the DCT2000 allows developers to perform installation and acceptance testing. Catapult Telephony Solutions Catapult delivers this expertise. Working with customers to develop innovative solutions, Catapult supports the continual evolution of the telecom industry and the dynamic progress of the Telephony market. Catapult is uniquely positioned to provide telecom test solutions that enable the products and services of tomorrow s telephony networks. Catapult Support With one of the highest industry ratios of application engineers to sales engineers, Catapult provides a global service infrastructure that delivers world-class customer support. Catapult Application Engineers (AEs) are committed to helping customers meet their telecom test challenges. Comprehensive Training Training is available to ensure the rapid and smooth installation of each Catapult test system. Training materials are tailored to the needs and experience level of the users and, during the training process, demonstration scripts specific to the customer s test environment may be generated. Class sizes are usually small to allow maximum interaction between the students and instructor. Catapult AEs provide both theoretical and practical knowledge in the telecom test arena. Customer Satisfaction Catapult is committed to providing quality support services and has the resources in place to help maximize the utility and value of the DCT2000 in almost any telecom test environment. Catapult Communications understands telephony technology and provides the world s leading telephony companies with testing tools. To find out whether the protocol stacks you require for testing are available please contact your local Catapult Communication sales office for further assistance.

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