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Media Gateway Control Protocol H.248 / MEGACO Media Gateway Control Protocol Basics

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Media Gateway Control Protocol H.248 / MEGACO Media Gateway Control Protocol Basics C&I Training on Conformity and Interoperability ITU-D Jun/2015 Agenda 1. Next-generation Networks (NGN) basic concepts. Integration testing – interoperability aspects. ITU-T Q.3909 and ITU-D Q26/2 Report 2. SIP Protocol 3. H.248 / Sigtran Protocol 4. NGN Lab Instrumentation; Protocols: SIP 5. NGN Lab Instrumentation; Protocols: H.248/Sigtran 2 Next-generation Networks (NGN) basic concepts. Integration testing – interoperability aspects. ITU-T Q.3909 and ITU-D Q26/2 Report TDM Network TDM Network Basic topology • Advantages of circuit-switched Transit phone networks: ― Capillarity ― QoS – Quality of Service ― Real-time voice optimized network • Disadvantages of circuit-switched Lex Lex phone networks: Transport ― Resource monopolization Network ― Hierarchical network ― Closed systems supplied by limited vendors ― Specialized network ― Low growth rate 5 TDM Network Circuit Switch SCC#7 Call Serv. Control Supl. Subscriber SWITCH Subscriber B Lines Lines FABRIC A Trunks Sinalling Voice Circuits 6 TDM Network Basic call example Animation of an PSTN (TDM) Phone call 7 Network Convergence Network Convergence Data Network Data networks based on TCP / IP Protocol began in the late 60's when the first networks have emerged through the ARPANET , " joining " North American universities . Advantages Disadvantages • Optimized resource • In the past - no quality usage of service (QoS) guarantee • Not hierarchical • Nowadays – some QoS • Multi-service Network garantee • Steady year-long growth IP Network Si Si It is possible to talk over IP Networks 9 Network Convergence Basics • The explosion of data transfer has revolutionized the telecommunication environment, especially the Internet (www, FTP, email, Facebook, Twitter, WhatsApp, Skype), indicating a shift from a “Voice Based” network to a "Data Based" network. 10 Network Convergence High level view of the converged environment Always on with any devices Anytime, anywhere and in any form Voice and multimedia Self service, intuitive Simple for the end user Secure, trusted and reliable 11 Network Convergence Multi-service Networks Single data-based telecommunications networks providing high-quality integrated voice, video and data services, strategically offering multi- media based services and minimizing costs for both providers and consumers. • Factors propelling convergence: ― Vigorous data traffic growth ― Technological factors . Statistical multiplexing . Protocols and networks such as IP/MPLS that transport media with guaranteed quality of service. Routers, computers, gateways and other elements are simpler, more economical and easier to manage than TDM telephone network equipment. Codecs: high-quality voice/video compression and packing. 12 NGN NGN Definition of NGN ITU-T Recommendation Y.2001 Application and Services Layer "A packet-based network able to provide telecommunication services and able to make use of multiple broadband, QoS Open/Standard Interface enabled transport technologies and in which service-related functions are independent from underlying transport- Call Control related technologies. Layer It enables unfettered access for users to networks and to competing service Open/Standard providers and/or services of their choice. Interface It supports generalized mobility which will allow consistent and ubiquitous provision of services to users." Infrastructure and Data Transport Layer 4 NGN Enabling Packet Switching It is possible to talk over IP Networks SOFTSWITCH SCC#7 / Call Sup. SIGTRAN Control Serv. Signaling takes typically different path than media does G Subscriber Lines ACCESS W GATEWAY B IP Subscriber G A Lines W TRUNK GW GATEWAY Trunks Sinalling Media Packets 15 NGN NGN basic concepts • Packet-based transfer • Separation of control functions among bearer capabilities, call/session, and application/ service • Decoupling of service provision from transport, and provision of open interfaces • Support for a wide range of services, applications and mechanisms based on service building blocks (including real time/ streaming/ non- real time and multimedia services) • Broadband capabilities with end-to-end QoS (Quality of Service) • Interworking with legacy networks via open interfaces 16 NGN NGN basic concepts • Generalized mobility • Unfettered access by users to different service providers • Unified service characteristics for the same service as perceived by the user • Converged services between fixed/mobile • Independence of service-related functions from underlying transport technologies • Support of multiple last mile technologies • Compliant with all regulatory requirements, for example concerning emergency communications, security, privacy, lawful interception, etc. 17 NGN NGN basic concepts TDM Architecture NGN Architecture IN Service Platform NGIN Services SIP Session Call Control Control Switching H.248 MGCP SIP Switching Transport Subscriber Media A/D Trunk User 18 NGN Three Layers • Responsible for services offered to users connected to the network Application and Services Layer • Responsible for defining, supervising, clearing Open/Standard and rating calls over the IP network. The Interface functions of this layer are: ― Signaling Call Control ― Call Control Layer ― Service Layer Access Open/Standard • This is the layer where the media servers are, Interface responsible for: ― Processing media Infrastructure and Data ― Message recording and playback Transport Layer ― Text-to-speech conversion and speech recognition 19 NGN NGN – Softswitch Approach Service Application NMS Media Server IN Billing Server SIP‐I Control SIGTRAN SIGTRAN H.248 / MGCP H.248 / MGCP Core SIP SIP H.323 H.323 SG Access LMG SS7 MGW SBC IP IAD PRI / R2 IP MSAN PSTN POTS / IP Private PBX Network 20 NGN NGN basic concept • SS7 message conversion to the • Establishment and termination of • Media adaptation between IP network (SIGTRAN). sessions in IP network. networks. • Establishes and terminates IP- • Maintains the state of all calls • Protocol conversion between IP SS7 connections. Keeps the and the resources allocated to and TDM connection status between them. networks. • Create and delete protocol • Send/receive signals and entities. messages to/from other networks and protocols • MGC provides the QoS information. 21 NGN Motivation User needs ― Higher-speed Internet NGN – to remember ― Low cost ― Transparency between wired and wireless “A proposal to evolve technology current voice-based ― Low-cost apps with user-friendly interfaces telecommunication networks to data-based Service Provider Goals networks, integrating voice, ― Easily manageable networks video and data, combining ― Planned networks wired and wireless ― Services independent of networks technologies, and giving ― Networks that can evolve users unlimited, ― Simple, open user access uninterrupted access with ― Create open, fast platforms support for mobility.” ― Guaranteed network QoS 22 NGN Class V Class V SofftSwitch basic call 23 NGN architecture and technologies NGN architecture and technologies Residential Gateway MGC MGC SIP-T / SIP-I / H.323 H.248 / MGCP H.248 / MGCP IP RTP / RTCP AGW AGW Analog Analog Phone Phone 25 NGN architecture and technologies Trunk Gateway MGC MGC SIP / H.323 / SIP-T / SIP-I ISUP ISUP IP SS7 SS7 H.248 / H.248 / MGCP MGCP PSTN PSTN E1 / T1 E1 / T1 RTP / RTCP MGW MGW 26 NGN architecture and technologies Signalling Gateway MGC MGC SIGTRAN SIGTRAN SIP-T/SIP-I / H.323 IP ISUP SG H.248 / H.248 / SG MGCP MGCP SS7 SS7 PSTN PSTN E1 / T1 E1 / T1 RTP / RTCP MGW MGW 27 ITU-T Q.3909 28 ITU-T Q.3909 Specification process for NGN conformance testing and interoperability testing Define the target Define specifications Define test Build up test bed and (service, application, (Protocol, Service, QoS) specifications to examine tests protocol, function) examine tests From ITU‐T 29 Points and Protocols to test Most requested SIP-I tests M3UA H.248 SIP/H323 ISUP ISDN-PRI SIP SIP Tester SCC#7 -ISUP Sgtran M3UA H.248 SIP-I SIP /H.323 ISDN-PRI SIP Test type: Test type: Test type: Test type: Test type: Test type: Test type: Conformance Conformance Conformance Conformance Conformance Conformance Performance Performance Functional tests (Traffic) (Traffic) Voice Quality Who request: Who request: Who request: Who request: Who request: Interoperability, SIP-ISUP Who request: Service Provider Service Provider Service Provider Service Provider ANATEL Who request: Service Provider ANATEL Service Provider Anatel Manufacturer Manufacturer (consulting (consulting services) services) Test Activities Protocols Sigtran H.323 or SIP IP NETWORK MEGACO MGCP Where to measure? Testing Methods What to measure? • Functional How to measure? • Interoperability • Conformance • Interworking • Performance 31 Test Activities Protocols International Documents Other documents standards ITU-T, ETSI, IETF, ... Tests Procedures Profiles Sigtran Sigtran Sigtran Sigtran H.323 or SIP H.323 or SIP H.323 or SIP H.323 or SIP H.248 H.248 H.248 H.248 SIP-I SIP-I SIP-I SIP-I What to measure? Where to measure? Tester 32 Tests - What and Where to measure? • What to Measure? ― Measurement of messages and parameters of NGN protocols in the IP network. ― Performance: signaling and voice traffic ― Evaluation of quality and intelligibility of voice • Where to Measure? ― Choice of adequate test system ― Localization of the points of measurement ― Definition of the testing methods 33 Conformance / Interoperability Tests • Advantage ― Ensure equipment network performance ― Ensure interoperability with equipment and systems from discrete vendors ― Quality
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