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Multimedia Access Platforms. Glen Freundlich Avaya, Inc. [email protected] IP Telephony Gateways. Gateway. Network A. Network B. Gateway converts between 2 networks: signaling conversion media (bearer) conversion service conversion

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Multimedia access platforms

Multimedia Access Platforms

Glen Freundlich

Avaya, Inc.

[email protected]


Ip telephony gateways
IP Telephony Gateways

Gateway

Network A

Network B

  • Gateway converts between 2 networks:

  • signaling conversion

  • media (bearer) conversion

  • service conversion

  • Networks could be same types (firewall, NAT).


Ip isdn gateway
IP-ISDN Gateway

Signaling conversion

Gateway

D channel

H.323, SIP

B channel

RTP

Bearer conversion

Gateway consists of multiple functions which need not

co-exist in same physical box.


Gateway decomposition
Gateway Decomposition

Gateway

Signaling

Gateway

Media

Gateway

Controller

Media

Gateway

H.248/Megaco


Ietf itu collaboration
IETF/ITU Collaboration

  • Work begun independently in 1998 in IETF, ITU-T SG16, ETSI TIPHON

  • ETSI TIPHON and MSF became suppliers of requirements

  • Agreement at management level in March 1999

    • IETF Megaco WG and ITU-T SG16 Q14 develop gateway control protocol as a joint project

    • Megaco to own requirements document

    • Q14 to own final protocol standard


Gateway control protocols
Gateway Control Protocols

NCS/J.162

IPDC

TGCP/J.171

MGCP

SGCP

MDCP

H.248/Megaco

others


Future collaboration
Future Collaboration?

  • Additions to H.248 for a Version 2

  • Package coordination

    • reduce or eliminate overlap

    • validate architecture

    • check for completeness

  • Interoperability/testing

  • Interworking (e.g., to H.323, SIP, BICC)

  • ???


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