[asterisk-dev] ACK - wrong URI?

[Chris Maciejewski]

Hi Olle,

Thanks for your reply.

This is exactly what common sense tells me too:
> The Contact: we get in the 200 OK is exactly the address we need to
> send the ACK to.

But could you please point me in the right part of RFC 3261 which
describes this?

I have spent best part of my day today reading RFC 3261 all over
again, and failed to find the right paragraph.

Thanks

Chris

2009/3/16 Olle E. Johansson <oej at edvina.net>:
>
> 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
>
>
>
>
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