[SIPForum-discussion] unnecessary 183 session progress

Kevin P. Fleming kpfleming at digium.com
Mon Mar 12 17:54:47 UTC 2012

On 03/11/2012 06:58 AM, Sam wrote:

> This one is know behavior with some of the SBC that for 2-3 ms they
> send 183 false ring,
> on your gateway you can block the 183 without sdp , i guess that will
> work for you .
> This is not standard behavior !

Please tell us what 'standard behavior' this violates. As far as I am 
aware, there are no statements in any SIP (or SIP-related) RFC that 
would restrict a SIP UAS from sending a 183 response followed by a 484 

Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
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445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
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