Hi,

What is the recommended behavior when you receive a SDP offer with a 
RTP/AVP media protocol including a crypto attribute ?

Ignore the media ?
Ignore the crypto attribute ?
Process it as a RTP/SAVP when SRTP is locally supported ? In that case 
answer with a RTP/AVP or change it to a RTP/SAVP ?

Is there any document that actually restricts the use of a crypto 
attribute to a media with RTP/SAVP ? (RFC4568 doesn't)

SNOM is one the several producers of such offers when they want to 
optionally offer SRTP.

Their argument for not using two medias (RTP/AVP & RTP/SAVP) by default 
in the offer (as it should be) is that some proxies doesn't support 
multiples medias, are you aware of such proxies ?

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