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Finalization of ATM SDP Work for Multimedia Session Control Ahead of IETF Meeting

ray-dorsey avatar
ray-dorsey
5 diapositives · 180 Views · Nov 30, 2014

The status update on ATM SDP work within the Multiparty Multimedia Session Control (MMUSIC) working group highlights the progress made in standardizing SDP conventions for ATM bearer connections. This meeting marks the last call before the upcoming IETF conference, emphasizing the importance of preserving standard SDP syntax (RFC 2327). Discussions, comments, and critiques from stakeholders have been collected, and the work is substantially complete. Input is still needed for finalization and approval as it relates to various ATM applications and bearer types.

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Finalization of ATM SDP Work for Multimedia Session Control Ahead of IETF Meeting
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  1. Status of ATM SDP work • Work item of Multiparty Multimedia Session Control (mmusic) WG • Last call before next IETF meeting • SDP conventions for controlling/describing ATM bearer connections • Preserve standard SDP (rfc2327) syntax • Applications to use subsets • ATM applications addressed • SDP descriptions constructed by bearer nodes or call agents • Used with SIP, MGCP, Megaco etc. • Bearer connection types • SVC set-up for new service connection - AAL1, 2 and 5 • Assign existing resources - VCCs (AAL 1, 2 and 5) and CIDs (AAL2) • Comments and discussions on mailing list atmsdp@eng.fore.com • Several, detailed comments in May - July 2000. • All comments currently accounted for. Workis substantially complete. • Need further critique, finalization and approval

  2. Media GatewayController Media GatewayController Edge SVC Edge PVC Core SVC Core SVC Edge SVC Edge PVC General Reference Model Q.1901 ISUP SIP Q.1901 ISUP SIP SS7 Network/ SIP MGCP/Megaco/ SIP MGCP/Megaco/ SIP Optional (MGCP/ Megaco/SIP) Optional (MGCP/ Megaco/SIP) Trunk/Edge Media Gateway Trunk/Edge Media Gateway Edge Switch (ATM/AAL2) ATM EdgeNetwork Edge Switch (ATM/AAL2) ATM EdgeNetwork ATM CoreNetwork TDM/ analog ports TDM/ analog ports Optional Bearer Signaling(Q.2931 and/or Q.2630.1) Optional Bearer Signaling(Q.2931 and/or Q.2630.1) Optional Bearer Signaling(Q.2931 and/or Q.2630.1) End-to-end SVC BEARER OPTIONS Edge PVC Core PVC Edge PVC Optional ATM Endpoints Optional ATM Endpoints TDM/Analog Endpoints TDM/Analog Endpoints

  3. Summary of Description Capabilities • Bearer Network Identification (ATM) • ATM address self-identification • VC and CID addressing • RTP payload type delcaration for AAL1 and AAL5 audio • AAL2 profile declaration - standard, custom • AAL5 applications include data, video, H.323c and af-vtoa-83 • Correlation of service-level connections with ATM bearer connections • Mapping of codecs into services • ATM parameters • Adaptation type, QoS class, ATM transfer capability / service category, broadband bearer class, traffic descriptor, ABR parameters, CPS parameters and SSCS parameters • Special capabilities: • Leaf initiated join, anycast, lawful wiretap, SVC caching

  4. ATM SDP Examples (1) v=0 o=- A3C47F21456789F0 0 ATM - - s=- c=ATM NSAP 47.0091.8100.0000.0060.3e64.fd01.0060.3e64.fd01.00 t=0 0 m=audio $ AAL1/AVP 18 0 96 a=atmmap:96 G727-32 a=eecid:B3D58E32 ----------------------------------------------------------------------------- v=0 o=- A3C47F21456789F0 0 ATM - - s=- c=ATM NSAP 47.0091.8100.0000.0060.3e64.fd01.0060.3e64.fd01.00 t=0 0 m=audio $ AAL2/ITU 8 AAL2/custom 100 AAL2/ITU 1 a=eecid:B3E32

  5. ATM SDP Examples (2) v=0 o=- 2873397497 0 ATM - - s=- c=ATM - - t=0 0 m=audio $ - - a=bearertype:SVC on ----------------------------------------------------------------------------- m=data 7/6/$ - - a=aalType:AAL5 a=aal5App:assuredSSCOP ---------------------------------------------------------------------------- m=video 9/3/$ AAL5/AVP ITUMPEG2