Colin and I have been working on a presentation for the MMUSIC meeting
on Friday. Colin will say how we plan to use SDP for DCCP-UDP and we
will then ask the group for help, ideally a request to point us at
something we can use. A key question remains: How to signal a server
that supports both native and UDP-encapsulated DCCP?
http://www.ietf.org/proceedings/80/agenda/mmusic.htm
http://www.ietf.org/proceedings/80/slides/mmusic-8.pdf
In the build-up to Friday's meeting, we'd welcome discussion to help
progress this (ideally on the MMUSIC list). Our two options described in
the slides are illustrated by two examples:
Signalling that uses a new proto in SDP m= line to indicate DCCP, plus
the SDP connection-oriented media extensions [RFC 4145], as per current
draft.
v=0
o=alice 1129377363 1 IN IP4 192.0.2.47
s=-
c=IN IP4 192.0.2.47
t=0 0
m=video 5004 DCCP/RTP/AVP 99
a=rtcp-mux
a=rtpmap:99 h261/90000
a=dccp-service-code:SC=x5254505
a=dccp-in-udp:9999
a=setup:passive
a=connection:new
or a new m= proto value.
v=0
o=alice 1129377363 1 IN IP4 192.0.2.47
s=-
c=IN IP4 192.0.2.47
t=0 0
m=video 5004 DCCP-UDP/RTP/AVP 99
a=rtcp-mux
a=rtpmap:99 h261/90000
a=dccp-service-code:SC=x52545056
a=setup:passive
a=connection:new
a=dccp-udp-port:9999
Please see the slides/draft for details.
We'd love to see this draft published.
Best wishes,
Gorry & Colin
