[asterisk-dev] ACK - wrong URI?

[Olle E. Johansson]

16 mar 2009 kl. 12.30 skrev Chris Maciejewski:

> Hi,
>
> It seems to me Asterisk (1.6.1) is wrongly using "Contact" header from
> "200 OK" instead of original INVITE's URI when sending ACK to "200 OK"
Why is this wrong?

The Contact: we get in the 200 OK is exactly the address we need to  
send the ACK to.

/O

>
> My scenario:
>
> 1. Asterisk sends INVITE to 442088462718 at example.com:
>
> INVITE sip:442088462718 at example.com SIP/2.0
> From: "John Smith" <sip:NA@{some_ip_2}>;tag=as7ff91d10
> To: <sip:442088462718 at example.com>
> Contact: <sip:NA@{some_ip_2}>
> {body/some headers omitted}
>
> 2. 442088462718 at example.com replies with 100, 180 and finally:
>
> SIP/2.0 200 OK
> From: "John Smith" <sip:NA@{some_ip_2}>;tag=as7ff91d10
> To: <sip:442088462718 at example.com>;tag=2UBy3tD90HyrH
> Contact: <sip:{__CONTACT_IP__}>
> {body/some headers omitted}
>
> 3. Asterisk sends ACK with {CONTACT_IP} from "200 OK", rather than
> sip:442088462718 at example.com as in originaly INVITE:
>
> ACK sip:{__CONTACT_IP__}:5060 SIP/2.0
> Max-Forwards: 69
> From: "John Smith" <sip:NA@{some_ip_2}>;tag=as7ff91d10
> To: <sip:442088462718 at example.com>;tag=2UBy3tD90HyrH
> Contact: <sip:NA@{some_ip_2}>
> {some headers omitted}
>
> Is it a bug in Asterisk, or is it RFC 3261 complaint to use "Contact"
> from "200 OK" as ACK's URI?
>
> Best regards
>
> Chris
>
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* Olle E Johansson - oej at edvina.net
* Cell phone +46 70 593 68 51, Office +46 8 96 40 20, Sweden