[SR-Users] RV: CANCEL not being matched by tm module when via address does not have port included

[Carsten Bock]

Hi,

it's kind of funny: I quit at Telefonica six years ago, to do
Open-Source IMS based on Kamailio... ;-) Good to see, that Telefonica
is checking out open-source. :-)

This SHOULD not be an issue, as the port SHOULD default to 5060 if not
present. I can check the sources in the next couple of days.

Thanks,
Carsten



2017-11-22 12:57 GMT+01:00 CARLOS GARCIA MORCHON
<carlos.garciamorchon at telefonica.com>:
> Hi,
>
>
>
> I have an IMS core deployed using kamailio 5.0.2. Calls from clients are
> reaching the core pcscf from a freeswitch (with address A.A.A.A) + a
> kamailio acting as proxy (with address B.B.B.B), so the INVITE request looks
> like this:
>
>
>
>
>
> INVITE sip:1111111111 at mnc001.mcc001.3gppnetwork.org SIP/2.0
>
> Record-Route: <sip:A.A.A.A;lr>
>
> Via: SIP/2.0/UDP
> A.A.A.A;branch=z9hG4bK8735.ef7a61e110f335b2e92a8c1d430de585.0
>
> Via: SIP/2.0/UDP
> B.B.B.B:5080;received=B.B.B.B;rport=5080;branch=z9hG4bKHpB704ZaXSKtm
>
> Max-Forwards: 65
>
> From: "222222222" <sip:222222222 at B.B.B.B>;tag=eytD49ymQr71S
>
> To: <sip:1111111111 at mnc001.mcc001.3gppnetwork.org>
>
> Call-ID: 77d249c0-487c-1236-1997-00163edbaa97
>
> CSeq: 115249948 INVITE
>
> Contact: <sip:mod_sofia at B.B.B.B:5080>
>
> User-Agent:
> FreeSWITCH-mod_sofia/1.6.19+git~20170927T175834Z~38f568d343~64bit
>
> Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER,
> REFER, NOTIFY
>
> Supported: timer, path, replaces
>
> Allow-Events: talk, hold, conference, refer
>
> Content-Type: application/sdp
>
> Content-Disposition: session
>
> Content-Length: 224
>
> P-Charge-Info: <sip:222222222 at mobile.tuenti.int>;npi=ISDN;noa=4
>
> X-FS-Support: update_display,send_info
>
> Remote-Party-ID: "222222222"
> <sip:222222222 at B.B.B.B>;party=calling;screen=yes;privacy=off
>
>
>
>
>
> If the client cancels the request, the CANCEL request that gets to the core
> pcscf looks like this:
>
>
>
> CANCEL sip:1111111111 at mnc001.mcc001.3gppnetwork.org SIP/2.0
>
> Via: SIP/2.0/UDP
> A.A.A.A;branch=z9hG4bK8735.ef7a61e110f335b2e92a8c1d430de585.0
>
> Max-Forwards: 65
>
> From: "222222222" <sip:222222222 at B.B.B.B>;tag=eytD49ymQr71S
>
> To: <sip:1111111111 at mnc001.mcc001.3gppnetwork.org>
>
> Call-ID: 77d249c0-487c-1236-1997-00163edbaa97
>
> CSeq: 115249948 CANCEL
>
> Content-Length: 0
>
> Reason: Q.850;cause=16;text="Normal Call Clearing"
>
>
>
> The processing of the CANCEL at the pcscf is eventually reaching the
> t_check_trans() function, but the logs return “no CANCEL matching found!”
> and thus the processing ends. I have followed the code up to the
> via_matching function in the t_lookup.c file of the tm module source and
> added some logs. The via matching is failing at the port comparison (the
> port stored for the INVITE is “5060”, the port stored for the CANCEL is “0”.
>
> The flow works ok with a different client (connected directly to the core)
> which includes the port in the Via headers.
>
> ¿Can this be a bug in kamailio or am I doing something wrong?. AFAIK The RFC
> 3261 does not mandate to include the ports in the sent-by element of the Via
> header
>
>
>
> Thanks!
>
>
>
> Carlos
>
>
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