[SR-Users] Error with 'Contact' field replacing

[Konstantin Shpinev]

Hi!

I have a problem with Kamailio. Sometimes (can not catch the moment
and conditions of) situations arise when, calling from AAA to uri XXX
call comes to uri YYY. The call comes from PSTN to the gray subnet of
user-agents registered in kamailio. As the PSTN we using Audiocodes
mediant.

Kamailio ver. 1.5.3

Mediant host: 172.19.32.2, Kamailio host: 172.19.32.3

XXX host: 172.19.32.33, YYY host: 192.168.1.203

I put a line in the log section route_branch:

> Apr 28 12:59:20 sipproxy /ks/sbin/kamailio[18294]: [INFO] new branch at sip:XXX at 172.19.32.33:5060;user=phone


Then in the log module acc wrote:

> Apr 28 12:59:21 sipproxy /ks/sbin/kamailio[18302]: ACC: transaction answered: timestamp=1272473961;method=BYE;from_tag=1e76ae41;to_tag=1c1795565414;call_id=17

955646162422000234627 at 172.19.32.2;code=481;reason=Call/Transaction
Does Not Exist;from_uri=sip:XXX at 172.19.32.3
<sip%3AXXX at 172.19.32.3>;from_username=XXX;from_name=;from_domain=

172.19.32.3;to_uri=sip:AAA at 172.19.32.2
<sip%3AAAA at 172.19.32.2>;to_username=AAA;to_name=;to_domain=172.19.32.2;request_uri=sip:AAA at 172.19.32.2
<sip%3AAAA at 172.19.32.2>;request_username=AAA;route_id=;route_name=;route_type_id=;destination=;calllist_id=

Despite the error, the call passes, but to the another uri.

Here's the log of the mediant:
1:

> Apr 28 12:52:31 172.19.32.2 (      lgr_flow)(44244101  )  ---- Outgoing SIP Message to 172.19.32.3:5060 ----

Apr 28 12:52:31 172.19.32.2 ACK sip:XXX at 172.19.32.33:5060;user=phone
SIP/2.0^M Via: SIP/2.0/UDP 172.19.32.2;branch=z9hG4bKac1897823584^M
Max-Forwards: 70^M From: <sip:AAA at 172.19.32.2
<sip%3AAAA at 172.19.32.2>>;tag=1c1795565414^M To: <sip:XXX at 172.19.32.3
<sip%3AXXX at 172.19.32.3>>;tag=1e76ae41^M Call-ID:
17955646162422000234627 at 172.19.32.2^M CSeq: 1 ACK Contact:
<sip:AAA at 172.19.32.2 <sip%3AAAA at 172.19.32.2>>^M Route:
<sip:172.19.32.3;lr;ftag=1c1795565414;vsf=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA->^M
Supported: em,timer,replaces,path,early-session,resource-priority^M
Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE^M
*User-Agent: Audiocodes-Sip-Gateway-Mediant 2000/v.5.00A.045.003*^M
Content-Length: 0

As you can see, in 1. all is well. But then:

2:

> .....  ---- Incoming SIP Message from 172.19.32.3:5060 ----

....From: <sip:AAA at 172.19.32.2 <sip%3AAAA at 172.19.32.2>>;tag=1c1795565414^M
> Call-ID: 17955646162422000234627 at 172.19.32.2^M CSeq: 1 INVITE^M Allow:
> INVITE, ACK, CANCEL,OPTIONS, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, INFO^M
> Content-Type: application/sdp^M *User-Agent: Zoiper for Windows rev.1105*^M
> Content-Length: 232^M ^M v=0^M *o=Zoiper_user 0 0 IN IP4 192.168.1.203^M
> s=Zoiper_session^M c=IN IP4 192.168.1.203^*M t=0 0^M m=audio 8000 RTP/AVP
> 8 0 101^M a=rtpmap:8 PCMA/8000^M a=rtpmap:0 PCMU/8000^M a=rtpmap:101
> telephone-event/8000^M a=fmtp:101 0-15^M a=sendrecv

And that is where the substitution occurred at the data fields
'Contact' an entirely different user-agent (uri YYY), which is also
registered on Kamailio. That it eventually comes to call. *Repeat: In
second SIP message from Kamailio 'Contact' field is replaced by
'Contact' of another (!) user-agent (YYY).*

There is a suspicion that an error occurs in a block:

> if (!lookup("location")) {

            switch ($retcode) {

                case -3:

...

                case -1:

...

                case -2:

...

            }

        }

    }


I myself anywhere 'Contact' field are not affected, so all suspected
to *locate() *from module Registrar.
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