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IP TELEPHONY DCT2000 TEST SOLUTIONS. Focus on Digital Telecom Test

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Focus on Digital Telecom Test

IP TELEPHONY

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IP Telephony Challenges

The telecommunications industry has experienced a marked proliferation of IP-based networks. This phenomenal growth in the IP sector has reshaped the future of voice traffic, encouraged the integration of multimedia and led to the evolution of IP Telephony. The rise of IP Telephony signals the migration of voice traffic from traditional circuit-switched networks to packet-switched networks.

The Benefits of IP Telephony

IP Telephony eliminates the cost of main-taining multiple networks each dedicated to the traffic of a single medium. By utilizing IP as a common transport layer, networks dedicated to voice, video, and data effec-tively 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 IP Telephony networks to reduce costs as well as to broaden the means of communication. Communication across IP networks has been elevated from simple Web and email 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 IP Telephony providers for an integrated solution. This integration across network environments increases reliability and interoperability while offering greater economies of scale.

The Challenges of IP 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, IP Telephony incorporates families of multi-media specifications.

A major challenge is the explosion in specifications. Today’s telecommunications standards bodies have numerous standing committees dedicated to delivering voice-over-packet solutions. The dominant IP Telephony standards are H.323 and SIP, which have been published by the International Telecommunication Union (ITU) and the Internet Engineering Task Force (IETF) respectively. H.323 standards include the H.323 protocol suite, MGCP, and RTP/RTCP while SIP standards include SIP, RTP/RTCP, H.428/Megaco and other networking protocols.

Meanwhile, manufacturers and providers attempt to rapidly produce and deploy IP 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. There-fore, IP Telephony products must undergo comprehensive testing to verify conformance to interworking protocols (such as SIP-T, SIGTRAN and BICC).

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1

Catapult IP Telephony Test

Solutions

Catapult has been meeting the testing needs of the telecommunications industry since 1985. 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 IP Telephony test challenges.

The Catapult DCT2000®Digital

Communications Test System provides a powerful and versatile platform allowing developers to test almost any H.323 and SIP IP 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 acces-sibility 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 simu-late and monitor multiple nodes in the IP Telephony network simultaneously. Catapult customers can test almost any H.323 or SIP IP network node, such as a Gateway, Gate-keeper, Multi-point Control Unit (MCU), Signaling Gateway, Media Gateway, Media Gateway 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 H.323 standards including the H.323 protocol suite, MGCP and RTP/RTCP protocols. The DCT2000 also supports SIP standards including SIP, RTP/RTCP and H.248/Megaco. Additionally, the DCT2000 supports the inter-working protocols between IP telephony and PSTN/Cellular networks, including SIP-T, SIGTRAN (M3UA, M2PA, SUA, SCTP, 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 IP 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 applica-tions 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

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SIP IP Netw

ork

Ga Signaling Gateway 3 CALL FLOW 1: H.323 To PSTN/Cellular Netw orks To PSTN/Cellular Netw orks Alerting Conn ect Ca H.225.0 RAS M essages Q.931 (H.225.0) Call Signalling M essages

IP Telephony Network Infrastructure

Internet Telephony delivers a flexible network infrastructure for transmitting voice calls across the integrated IP and traditional voice networks. Depending on the call scenario, various network nodes and IP Telephony protocols may be employed.

Network Key

Abbrev. Network Node

MCU Multipoint Control Unit MGC Media Gateway Controller

TE Terminal Equipment

PC Personal Computer

Protocol Spec Function

H.323 Signaling Encoder/Decoder

•H.245 ITU-T Call Control

•H.255.0.CS ITU-T Call Signaling

•H.225.0.RAS ITU-T Registration, Admission and Status

•H.235 ITU-T Security and Encryption

•H.450 ITU-T Supplementary Services

H.323 Annex E Encoder/Decoder/S.M. ITU-T Multiplexed Call Signaling Transport

MGCP Encoder/Decoder IETF Media Gateway Services

SIP Encoder/Decoder IETF Session Initiation

SIP-T Encoder/Decoder IETF Session Initiation for telephone

RTP Encoder/Decoder IETF Transport functions for real-time data

RTCP Encoder/Decoder IETF Control of RTP Communication

H.248 (Megaco) Encoder/Decoder IETF Gateway Control

IPv6 & v4 Encoder/Decoder/S.M. IETF IP Protocol

SCTP 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

Catapult Supported IP Telephony Protocols

*

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3 Soft Switch SIP A gent MGC MGC SIGTRAN SIG TRAN BICC SIP-T SIP SIP MGCP RTP RTP RTP SIP RTP SIP RTP SIP RTP RTP MGCP RTP H.248 (M EGACO) SIP MGC P SIP SIP RTP SIP RTP SIP RTP Residentia l Gateway Media Gateway 32 32 32 33 30 33 32 32 35 33 34 34 30 30 IP-Based Database (e.g. HLR) 31

Residential Netw

ork

Gatek eeper Gatek eeper MCU RTP RTP H.323 H.323 To PSTN/Cellular Netw orks To PSTN/Cellular Netw orks RTP H.3 23 RTP H.3 23 RTP H.3 23 RTP H.323 H.323 RTP RTP H.323 RTP H.3 23 RTP H.323RTP H.3 23 RTP H.3 23 RTP H.323 RTP H.3 23 RTP H.3 23 RTP H.323 RTP H.3 23 RTP H.3 23 RTP

H.323

IP Netw

ork

H.323 Gateway H.323 Gateway SI P-H.32 3 Gate way 30 30 30 29 29 30 29 30 29 30 29 30 29 GATEKEEPER ENDPOINT 1 ENDPOINT 2 Admission Request Adm ission Confirm ed Setup Admission Request Admission Confirm ed Call Pr oceeding Abbrev . Request Example Ack 200 MGCP Acknowledgment 200 1204 OK ACK SIP Acknowledgement

ACK info@catapult.com SIP/2.0 BYE

BYE

BYE sip:info@catapult.com SIP/2.0 CRCX Create Connection CRCX 1204 person@rgw-1.catapult.jp.co MGCP 1.0 DLCX Delete Connection DLCX 1210 person@rgw-1.catapult.jp.co MGCP 1.0 Invite Invitation

INVITE sip:info@catapult.com SIP/2.0 MDCX

Modify Connection

MDCX 1209 person@rgw-1.catapult.jp.co MGCP 1.0 NOTIFY

Notify Call Agent

NTFY 2005 person@rgw-1.catapult.jp.co MGCP 1.0 RQNT

Request Notification

RQNT 1206 person@rgw-1.catapult.jp.co MGCP 1.0 resp.XXX

SIP Acceptation Message

SIP/2.0 200 OK MGCP CALL A GENT RGW SIP A GENT RQNT Dialing Caller Off-Hook Ringing Connection Hang Up Free Dial T one Ack 200 ACK 200 DLCX+RQNT Ack 200 NOTIFY Ring

Callee Off Hook Caller Hear d Free Dial T one resp. 200 BYE resp. 180 resp. 200 INVITE ACK ACK 200 RQNT ACK 200 CRCX+RQNT RQNT MDCX+RQNT Ack 200 Ack 200 Ack 200 Ack 200 NOTIFY NOTIFY SIP

CALL FLOW 2: MGCP AND SIP

UDP% IP% Link Layer% PHY% RTP 30 RTP RTCP SIP/SIP-T% % IP% Link Layer% PHY% SIP/SIP-T 32 UDP TCP H.248% UDP% IP% Link Layer% PHY% H.248/MEGACO 31 MGCP% UDP% IP% Link Layer% PHY% MGCP 33 VUA% SCTP% IP% Link Layer% PHY% VUA 34 ISUP M2PA M2UA TCAP

TUP ISDN QSIG RNSAP RANAP SCCP% M3UA% SCTP% IP% Link Layer% PHY% M3UA IUA% SCTP% IP% Link Layer% PHY% IUA TCAP RANAP% SUA% SCTP% IP% Link Layer% PHY% SUA RNSAP ISUP TCAP TUP RNSAP RANAP SCCP% MTP3% % SCTP% IP% Link Layer% PHY% M3UA SIGTRAN MTP3% % MTP2% % MTP1% PHY% % MTP-3b STCMTP, MTP-3b & M3UA% % STCSSCOP M3UA% SCTP% % IP% Link Layer% PHY STCSCTP% % SCTP M2PA% SCTP% IP% Link Layer% PHY SSCF% SSCOP% AAL5% ATM% PHY 35 AAL5% % ATM% PHY IP% Link Layer% PHY BICC SSCOP SSCOPMCE BICC IP% Link Layer% PHY% H.323 29 H.225.0 Call Signaling TCP H.225.0 RAS% UDP H.245 Control Signaling

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DCT2000 Application:

Interoperability

Testing within an H.323 IP Telephony

Network

A manufacturer wants to verify the interop-erability of an H.323 Gateway and a Gatekeeper. The testing requires the devices under test to inter-work with other network devices: a PBX (Private Branch exchanges) and an H.323 Gateway. The manufacturer wants to avoid incurring the expense of procuring the external Gateway 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 H.323 Gateway, the DCT2000 also emulates the H.323 protocol suite, including H.225.0 CS for call setup, H.225.0 RAS for call registration, admission and status report and H.245 for control signaling. Meanwhile, the DCT2000 supports RTP (Real Time Transport Protocol) and RTCP (Real Time Transport Control Pro-tocol) to handle the IP 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 SIP IP Telephony Network

A manufacturer is developing a SIP Media Gateway Controller (MGC). The manufacturer wants to verify the MGC’s performance under heavy traffic. The simulated environment should include a SIP Agent, a Signaling Gateway and a Media Gateway. The manu-facturer decides to purchase a Catapult DCT2000 to perform the Load and Stress testing.

The DCT2000 provides the simulation func-tions of the required network devices in a single platform. The DCT2000 generates the desired message traffic, including SIP signaling for session establishment, H.248/Megaco media gateway control sig-naling and SIGTRAN (SIGsig-naling TRANsport) signaling for SS7 over IP. Under different load levels, the manufacturer can verify the performance of the MGC under test. Specifi-cally, 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.

TE TE TE TE PSTN/Cellular SIP IP Network H.323 IP Network PSTN/Cellular TE TE TE TE IP Origination – IP Termination

PSTN/Cellular Origination – IP Termination

IP Origination – PSTN/Cellular Termination PSTN/Cellular Origination – IP-PSTN/Cellular Termination Gateway DCT2000 SIP MGC Media Gateway SIP H.248/Megaco SIGTRAN DCT2000 DUT PBX Gateway Gatekeeper PBX Gateway H225RAS QSIG QSIG H225CS H225RAS H245 DCT RTP DUT DCT DCT DCT

Customer’s Device Under Test Utilizing the DCT2000 to simulate both a Gateway and PBX, a manufacturer is able to successfully verify features, functionality and interoperabilty of Gatekeeper and

Gateway products. With the flexibility of the DCT2000

test platform, a manufacturer is able to perform both load and

stress testing on a combined Gatekeeper/Gateway product. I N T E R O P E R A B I L I T Y T E S T I N G

L O A D A N D S T R E S S T E S T I N G

DCT2000 IP Telephony Test Applications

In addition to supporting communications within H.323 and SIP IP networks, IP Telephony also allows the inter-working between these IP networks and PSTN/Cellular networks. Manu-facturers and service providers may demand diverse types of IP Telephony applications.

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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 envi-ronment 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 IP 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.

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 inter-operability 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 IP 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 IP Telephony market. Catapult is uniquely positioned to provide telecom test solutions that enable the products and services of tomorrow’s IP telephony networks.

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WWW.CATAPULT.COM

North America

Corporate Headquarters Western Region 160 S. Whisman Road Mountain View, CA 94041 tel: 650 960·1025 fax: 650 960·1029 email: catapult@catapult.com Central and Eastern Regions HillCrest Commons Suite 312

1890 North Roselle Road Schaumburg, IL 60l95

tel: 847 884·0048 fax: 847 884·0162 email: chicago@catapult.com Southern Region

4011 W. Plano Parkway, Suite 105 Plano, TX 75093

tel: 972 398·6704 fax: 972 801·9208 email: dallas@catapult.com

Canada

Bell Mews Plaza

39 Robertson Road, Suite 261 Nepean, Ontario, Canada K2H 8R2

tel: 613 829·9360 fax: 613 829·4856 email: canada@catapult.com

Japan

Int’s Nakano Bldg. 8F 3-33-3 Nakano Nakano-ku, Tokyo 164-0001, Japan tel: +81 (0) 3 3384 7661 fax: +81 (0) 3 3384 7669 email: japan@catapult.com YRP Venture Bldg. Room 313 8-3 Hikarinooka Yokosuka-shi, Kanagawa 239-0847, Japan tel: +81 (0) 468 39 2511 fax: +81 (0) 468 39 2512

Europe

European Headquarters 1 Lansdowne Court, Bumpers Way Chippenham, England SN14 6RZ tel: +44 (0) 1249 460033 fax: +44 (0) 1249 46007 email: uk@catapult.com Central Region Talhofstrasse 32a D-82205 Gilching, Germany tel: +49 (0) 8105 77 86 30 fax: +49 (0) 8105 77 86 31 email: germany@catapult.com Southern Region

Centre d’Entreprises CGIA 5 & 7 Rue Marcelin Berthelot 92762 Antony Cedex, France

tel: +33 (0) 1 55 59 55 91 fax: +33 (0) 1 55 59 55 62 email: france@catapult.com Nordic Region Tekniikantie 12 02150 Espoo, Finland tel: +358 (0) 9 2517 2281 fax: +358 (0) 9 2517 2288 email: nordic@catapult.com Catapult Communications International Limited 105 North West Business Park Ballycoolin, Dublin 15 Republic of Ireland

tel: +353 (0) 1 885 2806 fax: +353 (0) 1 885 2807 email: ireland@catapult.com

DCT2000, PowerPCI and the Catapult logo are registered trade-marks of Catapult Communications Corporation. The names of other companies and products herein are trademarks or registered trademarks of their respective trademark owners. © 2002 Catapult Communications

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