Multimedia Access Platforms

1
Multimedia Access Platforms
Glen Freundlich Avaya, Inc.
ggf_at_avaya.com
2
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).

3
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.
4
Gateway Decomposition
Gateway
Signaling Gateway
Media Gateway Controller
Media Gateway
H.248/Megaco
5
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

6
Gateway Control Protocols
NCS/J.162
IPDC
TGCP/J.171
MGCP
SGCP
MDCP
H.248/Megaco
others
7
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)
• ???