You can simply send a reliable 183 with SDP which connect the media channel to 
some tone resouce to play announcement.

----- Original Message ----- 
From: "Andy Pandaram" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, August 25, 2005 7:31 PM
Subject: [Sip-implementors] 183 for early media


> Is there any guidelines for using 183 to play message for calls that could 
> not be completed sucessfully? (The called subscriber is busy or not 
> reachable)The draft-ietf-sip-183-00.txt is expired and 183 is now included as 
> part of RFC 3261. But the draft has listed few guidelines, scenarios and 
> issues which are not listed in so much detail in RFC 3261
>  
> Thanks
> Andy
> 
> 
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