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Re: [rtcweb] No Interim on SDES at this juncture

Bernard Aboba <bernard_aboba@hotmail.com> Wed, 19 June 2013 13:46 UTC

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From: Bernard Aboba <bernard_aboba@hotmail.com>
To: Michael Procter <michael@voip.co.uk>
Date: Wed, 19 Jun 2013 06:46:06 -0700
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] No Interim on SDES at this juncture
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Michael said: > 
> The PBX chooses its transmission key, and advertises it through
> SDES/SDP.  The browser chooses its transmission key and advertises it
> through DTLS-EKT. The media gateway has the job of matching up the
> SDES pieces with the EKT pieces, and thereafter forwarding packets.

[BA] Since the PBX can only handle SDES, and the media server speaksDTLS/SRTP-EKT,  the media server needs to provide the DTLS/SRTP-EKTkey to the SIP server so that it can be signaled to the PBX within SDES/SDP. Similarly, the SIP server needs to provide the SDES key signaled by thePBX to the media server so that it can communicate this in DTLS/SRTP-EKT. Therefore the PBX, media server, SIP server and browser endpoint end up possessing the keys, which is less than ideal.

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