Re: [rtcweb] Why SDP answer needs and ack … was Re: SDP Offer/Answer draft-jennings-rtcweb-signaling
Randell Jesup <randell-ietf@jesup.org> Thu, 20 October 2011 03:12 UTC
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Subject: Re: [rtcweb]
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On 10/19/2011 8:43 PM, Cullen Jennings wrote: > > I guess the question I am thinking about is how important is this use case. I'm a bit of > the fence on the topic. The primary use of INVITE with no offer is when doing a gateway > to some forms of H.323. It seem the odds of a gateway from RTCWeb to SIP to H323 is > pretty low so I have not been thinking about how to deal with > INVITE with no > offer much. I should think about it more but too few hours in the day :-) The primary use of bare INVITE in SIP I've seen is for an SBC to force a renegotiation by the two sides: A SBC B | <-------------------- media --------------------> | | <--- INVITE w/o SDP --- | | | ----- 200 OK w/OFFER -> | | | | ------ INVITE w/OFFER-> | | | <--- 200 OK w/ANSWER -- | | <---- ACK w/ANSWER ---- | | | | -------- ACK ---------> | | <--------------------- media -------------------> | This can let the SBC modify things in the process (like move media relaying to a new IP/port, change hold state), and other 3PCC things. -- Randell Jesup randell-ietf@jesup.org
- [rtcweb] SDP Offer/Answer draft-jennings-rtcweb... Cullen Jennings
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Iñaki Baz Castillo
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Iñaki Baz Castillo
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Ravindran Parthasarathi
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Iñaki Baz Castillo
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Ravindran Parthasarathi
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Iñaki Baz Castillo
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Ted Hardie
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Roman Shpount
- [rtcweb] API options for supporting fork with R... Harald Alvestrand
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Christer Holmberg
- Re: [rtcweb] API options for supporting fork wi... Iñaki Baz Castillo
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Iñaki Baz Castillo
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Christer Holmberg
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Iñaki Baz Castillo
- Re: [rtcweb] API options for supporting fork wi... Harald Alvestrand
- Re: [rtcweb] API options for supporting fork wi... Iñaki Baz Castillo
- Re: [rtcweb] API options for supporting fork wi... Stefan Håkansson LK
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Roy, Radhika R USA CIV (US)
- Re: [rtcweb] API options for supporting fork wi... Iñaki Baz Castillo
- Re: [rtcweb] API options for supporting fork wi... Stefan Håkansson LK
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Magnus Westerlund
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Iñaki Baz Castillo
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Eric Rescorla
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... BeckW
- Re: [rtcweb] API options for supporting fork wi... Roman Shpount
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Eric Rescorla
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Cullen Jennings
- [rtcweb] Why SDP answer needs and ack … was Re:... Cullen Jennings
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Cullen Jennings
- [rtcweb] Forking -Re: SDP Offer/Answer draft-je... Cullen Jennings
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Cullen Jennings
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Iñaki Baz Castillo
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Ravindran Parthasarathi
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Cullen Jennings
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Cullen Jennings
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Harald Alvestrand
- Re: [rtcweb] Why SDP answer needs and ack … was... Iñaki Baz Castillo
- Re: [rtcweb] Why SDP answer needs and ack … was... Harald Alvestrand
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Stefan Håkansson
- Re: [rtcweb] API options for supporting fork wi... Stefan Håkansson
- Re: [rtcweb] API options for supporting fork wi... Harald Alvestrand
- [rtcweb] Draft name change: draft-holmberg-mmus... Christer Holmberg
- Re: [rtcweb] API options for supporting fork wi... Stefan Håkansson LK
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Christer Holmberg
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Christer Holmberg
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Christer Holmberg
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Christer Holmberg
- Re: [rtcweb] Forking - Re: SDP Offer/Answer dra... Christer Holmberg
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Cullen Jennings
- Re: [rtcweb] Forking - Re: SDP Offer/Answer dra... Cullen Jennings
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Cullen Jennings
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Cullen Jennings
- Re: [rtcweb] Why SDP answer needs and ack … was... Cullen Jennings
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Marc Petit-Huguenin
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Cullen Jennings
- Re: [rtcweb] Why SDP answer needs and ack … was... Randell Jesup
- Re: [rtcweb] Why SDP answer needs and ack … was... Hadriel Kaplan
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Christer Holmberg
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Christer Holmberg
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Christer Holmberg
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Cullen Jennings
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Harald Alvestrand
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Christer Holmberg
- Re: [rtcweb] SDP Offer/Answer draft-jennings-rt... Cullen Jennings