[SR-Users] Kamailio doesn't response to some INVITE packages

[Volkan Oransoy]

Hi,

My Kamailio box works very well for a year, in front of a Freeswitch box.
Nowadays, some of my users live problems about receiving calls. But this
problem occurs on a couple of specific users. %1 of users complain about
it.  When I capture the traffic, I see that, Kamailio receives an invite
package from freeswitch but takes no action. Normally it should response
with a 100 trying message. Here is the INVITE package. 1.2.3.6 is the
Freeswitch box and 1.2.3.2 is the Kamailio box. I captured this package on
Kamailio box.


U 1.2.3.6:5060 -> 1.2.3.2:5060
INVITE sip:2000 at test.example.net SIP/2.0.
Via: SIP/2.0/UDP 1.2.3.6;rport;branch=z9hG4bKZU1Z76FvDZ26r.
Route: <sip:1.2.3.2>;lr.
Max-Forwards: 65.
From: "908508850000" <sip:908508850000 at test.example.net>;tag=KjcgDe0NyKN0B.
To: <sip:2000 at 88.235.112.33:1028>.
Call-ID: 72b344f4-1c09-1233-ad8d-0050568e9066.
CSeq: 70585075 INVITE.
Contact: <sip:mod_sofia at 1.2.3.6:5060>.
User-Agent:
FreeSWITCH-mod_sofia/1.4.14+git~20141119T221113Z~ca1d990cfc~64bit.
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER,
REFER, NOTIFY, PUBLISH, SUBSCRIBE.
Supported: timer, path, replaces.
Allow-Events: talk, hold, conference, presence, as-feature-event, dialog,
line-seize, call-info, sla, include-session-description, presence.winfo,
message-summary, refer.
Content-Type: application/sdp.
Content-Disposition: session.
Content-Length: 270.
X-AUTH-IP: 159.253.40.138.
X-BF-SRC: 2.
X-FS-Support: update_display,send_info.
Remote-Party-ID: "908508850000" <sip:908508850000 at test.example.net
>;party=calling;screen=yes;privacy=off.
.
v=0.
o=FreeSWITCH 1421813895 1421813896 IN IP4 1.2.3.6.
s=FreeSWITCH.
c=IN IP4 1.2.3.6.
t=0 0.
m=audio 28384 RTP/AVP 3 8 0 101 13.
a=rtpmap:3 GSM/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=ptime:20.

I use standart location lookup and relay procedure in Kamailio default
script.
Is there anything wrong with this INVITE package and how can I trace this
issue on Kamailio box?

Thank you.

/Volkan
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