[SR-Users] Distorted uri / Route header replaces the uri

[Daniel-Constantin Mierla]

Hello,

if I didn't mixed the order of nodes with their IP addresses, then the
ACK is having  the wrong address.

ACK being a request within dialog, it must have in R-URI the address
(URI) that was set by the callee, however, in no way the IP of the
dispatcher. So there is something in the path of sip signaling that is
breaking the Contact of the 200ok.

It could be that some node is using mistakenly fix_nated_contact() when
not being the first hop after NAT router. It is anyhow recommended to
use set_contact_alias() together with handle_ruri_alias() (see default
config for v5.1.x on how these are used).

Cheers,
Daniel


On 12.10.18 09:29, Abdulaziz Alghosh wrote:
> Greetings,
>
> in order to upgrade kamailio server from 3.0.3 to 5.1.4 version, I am
> conducting test calls and it is not completelly successful. The main
> components I have are:
> 1- Media Gateway (Asterisk) : 192.168.226.133
> 2- Signalling Gateway (Kamailio 5.1.4) 192.168.226.132
> 3- Global Dispatcher (Kamailio 3.0.3 in front of the Signalling
> Gateway.) : 192.168.226.130
>
> Both caller and callee have the dispatcher's IP as a proxy and their
> registration requests is passed to be registered at the Signalling
> Gateway (Kamailio 5.1.4) and saved on the MySQL server. The caller
> reaches the callee properly, who in its turn answeres the call and
> sends the OK msg to the caller who gets it. Unfortunately, when the
> caller sends the ACK for this INVITE to the callee, the ACK does not
> reach the callee because it is trapped by the dispatcher at the last
> stage because the uri was dropped and the Route header was used
> instead. This behaviour is abnormal since as I know the Route header
> should be converted into a Via header and the uri stays untouchable.
>
> The ACK was looped into the dispatcher itself .i.e. the dispatcher
> sent it to itself adding always the via header ""Via: SIP/2.0/UDP
> 192.168.226.130;branch=0"" endlessly.
>
> Once again, here is an example of the ACK before the dispatcher and
> how the dispatcher forwards the ACK afterwards.
>
> the supposed path is as following:
> caller --> GDP--> SGW --> MGW--> SGW --> GDP --> callee
>
> Although the GDP (before the calle after the SGW) received the uri
> well from SGW inside the ACK as it appears below:
>
> ACK
> sip:yyyyyyyyyyyy at 192.168.226.130:5060;rinstance=1608f7c153f40093;transport=UDP
> SIP/2.0
> Record-Route: <sip:192.168.226.132;lr=on;ftag=as3b989c5f>
> Via: SIP/2.0/UDP
> 192.168.226.132;branch=z9hG4bK136f.1e8349c235fff01ee1849f3456f8868a.0
> Via: SIP/2.0/UDP 192.168.226.133:5060;rport=5060;branch=z9hG4bK34871fe9
> Route: <sip:192.168.226.130;lr;ftag=as3b989c5f;did=d5b.87890dc6>
> Max-Forwards: 69
> From: "xxxxxxxxxxxxxx" <sip:xxxxxxxxxxxx at domain.com
> <mailto:sip%3Axxxxxxxxxxxx at domain.com>>;tag=as3b989c5f
> To: <sip:yyyyyyyyyyyyy at 192.168.226.132:5060
> <http://sip:yyyyyyyyyyyyy@192.168.226.132:5060>>;tag=1af2c424
> Contact: <sip:xxxxxxxxx at 192.168.226.133:5060
> <http://sip:xxxxxxxxx@192.168.226.133:5060>>
> Call-ID: 7ed2ab533d4c43086746d0e620bdff06 at domain.com
> <mailto:7ed2ab533d4c43086746d0e620bdff06 at domain.com>
> CSeq: 102 ACK
> User-Agent: MGW
> Content-Length: 0
>
> The global dipstacher (GDP) has used the Route header (which has no
> R-URI yyyyyyyyy) instead of the uri:
>
> ACK sip:192.168.226.130;lr;ftag=as3b989c5f;did=d5b.87890dc6 SIP/2.0
> Record-Route: <sip:192.168.226.132;lr=on;ftag=as3b989c5f>
> Via: SIP/2.0/UDP 192.168.226.130;branch=0
> Via: SIP/2.0/UDP
> 192.168.226.132;rport=5060;branch=z9hG4bK136f.1e8349c235fff01ee1849f3456f8868a.0
> Via: SIP/2.0/UDP 192.168.226.133:5060;rport=5060;branch=z9hG4bK34871fe9
> Max-Forwards: 68
> From: "xxxxxxxxxx" <sip:xxxxxxxxxxx at domain.com
> <mailto:sip%3Axxxxxxxxxxx at domain.com>>;tag=as3b989c5f
> To: <sip:yyyyyyyyy at 192.168.226.132:5060
> <http://sip:yyyyyyyyy@192.168.226.132:5060>>;tag=1af2c424
> Contact: <sip:xxxxxxx at 192.168.226.132:5060
> <http://sip:xxxxxxx@192.168.226.132:5060>>
> Call-ID: 7ed2ab533d4c43086746d0e620bdff06 at domain.com
> <mailto:7ed2ab533d4c43086746d0e620bdff06 at domain.com>
> CSeq: 102 ACK
> User-Agent: MGW
> Content-Length: 0
>
> Thanks in advance for your contribution
> Abdulaziz
>
>
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-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio World Conference -- www.kamailioworld.com
Kamailio Advanced Training, Nov 12-14, 2018, in Berlin -- www.asipto.com

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