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Re: [MMUSIC] Connection Data Capability (ccap) and IP-addresses (draft-ietf-mmusic-sdp-miscellaneous-caps-04)

Andrew Allen <aallen@blackberry.com> Fri, 22 March 2013 05:36 UTC

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From: Andrew Allen <aallen@blackberry.com>
To: Hadriel Kaplan <HKaplan@acmepacket.com>
Thread-Topic: [MMUSIC] Connection Data Capability (ccap) and IP-addresses (draft-ietf-mmusic-sdp-miscellaneous-caps-04)
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Date: Fri, 22 Mar 2013 05:35:58 +0000
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Cc: "mmusic@ietf.org (E-mail)" <mmusic@ietf.org>
Subject: Re: [MMUSIC] Connection Data Capability (ccap) and IP-addresses (draft-ietf-mmusic-sdp-miscellaneous-caps-04)
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CCAP is currently only used by 3GPP to allow the UA to choose between PS and CS for a terminating call at call setup when the UA has the possibility to use either PS or CS for the call.

Mid call Handover PS to CS and CS to PS uses other techniques and does not involve use of CCAP.

Andrew

-----Original Message-----
From: Hadriel Kaplan [mailto:HKaplan@acmepacket.com] 
Sent: Tuesday, March 19, 2013 10:22 AM
To: Andrew Allen
Cc: mmusic@ietf.org (E-mail)
Subject: Re: [MMUSIC] Connection Data Capability (ccap) and IP-addresses (draft-ietf-mmusic-sdp-miscellaneous-caps-04)


On Mar 19, 2013, at 8:27 AM, Andrew Allen <aallen@blackberry.com> wrote:

> CCAP is the essential feature required by 3GPP. It is used by 3GPP to negotiate the use of CS SDP to set up a CS call as an alternative to a packet switched audio stream.

Does it also need to be able to go from CS to IP sometime during a call, or once it's chosen to be CS it stays CS?

-hadriel


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