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Multimedia Access Platforms. Glen Freundlich Avaya, Inc. ggf@avaya.com. IP Telephony Gateways. Gateway. Network A. Network B. Gateway converts between 2 networks: signaling conversion media (bearer) conversion service conversion

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Presentation Transcript
multimedia access platforms

Multimedia Access Platforms

Glen Freundlich

Avaya, Inc.

ggf@avaya.com

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)
  • ???