[SR-Users] 1 via header

phillman25 phillman25 at gmail.com
Fri Nov 8 10:05:07 CET 2013

Dear List

I am trying to interconnect with a Cisco Call manager express, i am sending
the INVITE message with the below format:

INVITE sip:22775019 at SIP/2.0
Record-Route: <sip:;lr=on;ftag=685329680;did=671.51a2>
Via: SIP/2.0/UDP;branch=z9hG4bKda1d.291eab1622fb619ec7df3ca647581a19.0
Via: SIP/2.0/UDP;branch=z9hG4bKterm-4a32-99665015-6855A22775019-37284
From: 99665015 <sip:99665015 at;user=phone>;tag=685329680
To: 6855A22775019 <sip:6855A22775019 at;user=phone>
Call-ID: 6fea2437-2d338fcf-4efc6b90-2d08 at
Supported: timer
Session-Expires: 1800
Min-SE: 1800
Contact:  <sip:99665015 at>
Max-Forwards: 69
Content-Type: application/sdp
Content-Length: 528
P-hint: outbound

o=- 3099173 0 IN IP4
s=Cisco SDP 0
c=IN IP4
t=0 0
m=audio 52168 RTP/AVP 0 8 18 99 102 103 104 4 105 3 106 107 108 125 101 100
a=rtpmap:99 G.726-16/8000
a=rtpmap:102 G.726-24/8000
a=rtpmap:103 G.726-32/8000
a=rtpmap:104 G.723.1-H/8000
a=rtpmap:105 G.723.1-L/8000
a=rtpmap:106 G.729b/8000
a=rtpmap:107 G.723.1a-H/8000
a=rtpmap:108 G.723.1a-L/8000
a=rtpmap:125 G.nX64/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=rtpmap:100 X-NSE/8000
a=fmtp:100 192-194

The Cisco Manager Express replies by sending the TRYING message in the
below format with 1 via header:

SIP/2.0 100 Trying
Via: SIP/2.0/UDP;branch=z9hG4bKda1d.291eab1622fb619ec7df3ca647581a19.0,SIP/2.0/UDP ;branch=z9hG4bKterm-4a32-99665015-6855A22775019-37284
From: 99665015 <sip:99665015 at;user=phone>;tag=685329680
To: 6855A22775019 <sip:6855A22775019 at;user=phone>
Date: Tue, 05 Nov 2013 18:24:17 GMT
Call-ID: 6fea2437-2d338fcf-4efc6b90-2d08 at
Allow-Events: telephone-event
Server: Cisco-SIPGateway/IOS-12.x
Content-Length: 0

Seems like Kamailio is not accepting this, is the Trying message from the
client correct? Is it correct that he is sending 1 via header with 2 IP's
as opposed to 2 via headers with 1 IP in each via header? Otherwise is
there a solution for this?

Thanks in advance

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