[Asterisk-Dev] Incorrect behavior : address for SIP responses

[Marius S]

I am not very familiar with the SIP standards, however the behavior
you describe seems to be legit.

http://www.faqs.org/rfcs/rfc3581.html

   When the client sends the request, if the request is sent using UDP,
   the client MUST be prepared to receive the response on the same IP
   address and port it used to populate the source IP address and source
   port of the request.  For backwards compatibility, the client MUST
   still be prepared to receive a response on the port indicated in the
   sent-by field of the topmost Via header field value, as specified in
   Section 18.1.1 of SIP [1].

Marius

On 5/27/05, Christian Cayeux <Christian.Cayeux at alcatel.fr> wrote:
> Hello all,
> 
> When receiving a SIP request, I've observed that asterisk SIP channel
> returns responses to the address it was received from. For exemple, if a SIP
> UA, name it A, sends an Invite from a port UDP:7777 to asterisk port
> UDP:5060, then Asterisk replies a 100 Trying to A:7777! On so on for each
> response.
> 
> But this behavior is not compliant to RFC3261 ( on my understanding :-) ) :
> see section 18.2.2. Its says that (i understand that), when UDP is used and
> unless specified in Via, the response must be sent to UDP:5060.
> 
> Has anyone an opinion on that? Is it already a known problem?
> 
> Thanks in advance for info.
> 
> Christian.
> 
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