Subject: RE: [SIP] different types of URI in 'Contact'

From: Igor Slepchin <[email-masked]>
Date: Tue, 9 Jan 2001 22:51:06 -0500

non-SIP URLs are allowed in Contacts of REGISTER requests or redirect
responses, not in INVITEs or responses to INVITEs. 2543bis is fairly
explicit about this, e.g., Contact in INVITE responses is defined as a SIP
address where the UAS is reachable most directly.

---
Igor Slepchin

> -----Original Message-----
> From: Piotr S. Kossowski [mailto:[email-masked]]
> Sent: Tuesday, January 09, 2001 3:39 PM
> To: SIP discussion list
> Subject: [SIP] different types of URI in 'Contact'
> 
> 
> Hello,
> 
> I have got simple question:
> 
> Say that 'Contact' in 200 OK to INVITE req includes only one 
> URI: mailto.
> This is correct according to 'Contact' syntax. Section 11.2 of 
> rfc2543bis-2 says that "(...)'Contact' contains address where 
> the callee
> would like to be contacted fo subsequent transactions, 
> including the ACK
> for the current INVITE". If there is only one URI in the 
> 'Contact' e.g.
> 'mailto:' or 'http:' , how to send ACK to this destination. 
> From technical
> point of view it is easy, but i mean that UAS will never get ACK and
> will have to break just-established call because lack of ACK. 
> Could you correct me ?
> 
> Best Regards, Piotr
> 
> 
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