[SR-Users] Incorrect Contact address

Carlos Ruiz Díaz carlos.ruizdiaz at gmail.com
Wed Mar 5 19:57:41 CET 2014


Why is erroneous to have the contact header with the backend IP?

With the record-route on the 200 Ok, the ACK should be directed to the
backend IP, but containing a route header pointing to the Kamailio IP.
Kamailio will loose_route() this request and send it to the backend server
as expected.

Regards,


On Wed, Mar 5, 2014 at 3:53 PM, Marc Soda <msoda at coredial.com> wrote:

> Thanks Olle.  I am calling record_record() on the initial INVITE.  In
> fact, the OK has a Record-Route header:
>
> 1.1.1.1 is the endpoint
> 2.2.2.2 is the kamailio proxy
> 3.3.3.3 is the backend server
>
> SIP/2.0 200 OK
> Via: SIP/2.0/UDP 1.1.1.1:60077
> ;rport=46110;branch=z9hG4bK-d8754z-eb9768c7e3a2d1e7-1---d8754z-
> Record-Route: <sip:2.2.2.2;lr=on;ftag=db634167;nat=yes>
> From: <sip:sip7878_spqa at edge.domain.com;transport=UDP>;tag=db634167
> To: <sip:2155555555 at edge.coredial.com;transport=UDP>;tag=as3f9cf263
> Call-ID: MzI5YTA3YmRkNzFiZjhhZTRkNTc2OGE1ZTc5ZjdjMmM.
> CSeq: 2 INVITE
> User-Agent: CoreDialPBX
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
> Supported: replaces
> Contact: <sip:21555555555 at 3.3.3.3>
> Content-Type: application/sdp
> Content-Length: 266
>
> v=0
> o=root 13486 13487 IN IP4 3.3.3.3
> s=session
> c=IN IP4 3.3.3.3
> t=0 0
> m=audio 29990 RTP/AVP 0 8 101
> a=rtpmap:0 PCMU/8000
> a=rtpmap:8 PCMA/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> a=silenceSupp:off - - - -
> a=ptime:20
> a=sendrecv
>
> I don't think 3.3.3.3 should show up anywhere, it should be rewritten to
> 2.2.2.2.
>
>
> On Wed, Mar 5, 2014 at 1:34 PM, Olle E. Johansson <oej at edvina.net> wrote:
>
>>
>> On 05 Mar 2014, at 18:30, Marc Soda <msoda at coredial.com> wrote:
>>
>> I have Kamailio setup as a proxy in front of a backend server (Asterisk).
>>  When I make a call through the proxy, the Contact header in the 200 OK
>> that is returned to the client has the IP of the backend server in it.
>>  Thus, the client is sending it's ACK directly to the backend server.
>>
>> Is there a special method to rewrite the Contact header to be Kamailio's
>> IP?
>>
>> Check record_route() in the default configuration script. You need to add
>> a route set by using record_route() in the initial transaction.
>>
>> Cheers,
>> /O
>>
>>
>> Where is a good place in the config to do this?  (my config is loosely
>> based on this:
>> http://kb.asipto.com/asterisk:realtime:kamailio-4.0.x-asterisk-11.3.0-astdb
>> )
>>
>> Thanks!
>> Marc
>>
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>>
>>
>>
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>>
>>
>
> _______________________________________________
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>


-- 
Carlos
http://caruizdiaz.com
http://ngvoice.com
+595981146623
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