[Sip] query regarding SDP exchange

["Vishal Verma" <vishal@sonim-india.com>]

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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