Subject: [Sip] query regarding SDP exchange

From: "Vishal Verma" <[email-masked]>
Date: Tue, 18 Mar 2003 17:51:15 +0530

Hello friends ,
  I have query regarding SDP exchange during SIP call establishment

let us say user A  calls user B .User A supports audio codec 1 while user B
supports audio codec 2. In this situation SDPs will not match.

My questions are

1. What is the response code to indicate  this failure to originator ?

2. Are there any mandatory audio codecs that must be supported by SIP
devices?

regards, vishal

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