[SIPForum-discussion] Huawei Switch Media issue,

Krm-e krmeid at yahoo.com
Tue Sep 20 07:33:31 UTC 2011

This is happening at the call setup and then the phone send a PRACK and the call is canceled, is this has anything to do with the  silent supp=0 being sent in the SDP header? 

From: Olle E. Johansson <oej at edvina.net>
To: Kareem eid <krmeid at yahoo.com>
Cc: "discussion at sipforum.org" <discussion at sipforum.org>
Sent: Monday, September 19, 2011 10:28 PM
Subject: Re: [SIPForum-discussion] Huawei Switch Media issue,

18 sep 2011 kl. 09:03 skrev Kareem eid:

> Is there any way to find out why the Huawei switch  is sending c=IN IP4 in 180 ringing?

This used to be a way to indicate call hold, meaning they want to send you a ring tone, but don't receive any media. The reason why we do not recommend this is that this also blocks RTCP. The a=sendonly attribute would propably be a more "modern" way of indicating the same.

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