Hello,

We’re testing kamailio 4.3.4 with two kamailio’s communicating with each other. One of them is a gateway with rtpengine at the carrier side, the other is a basic sip router.

When calling a destination and cancelling the INVITE a 487 is received from the carrier and directly ACK’d by the first kamailio and in turn is forwarded to the second.

But the 487 response received by the 2^nd kamailio doesn’t have a Via header which results in kamailio printing the error: receive_msg(): no via found in reply.

Any ideas why the forwarded 487 doesn’t contain a Via header and how to fix this?

Note: IP’s are changed.

Carrier: 10.0.0.1

Kamailio 1: 10.14.0.1

Kamailio 2: 10.14.0.2

U 10.0.0.1:5060 -> 10.14.0.1:5060

SIP/2.0 487 Request Cancelled.

Via: SIP/2.0/UDP 10.14.0.1;branch=z9hG4bK8e28.642c68037d059634308d4be8fe3f0cdc.0.

From: "+31612345678" <sip:+31612345678@10.14.0.3:5060>;tag=109ac722.

To: <sip:003112345678@10.14.0.3:5060>;tag=sbcsipuas_1_C22196_20160314080307791_b59sb10.

Call-ID: 78100MjY3OGExZmMyODU2MzAyMzM5ODA3MmNhMDdlMzg0MzU.

Contact: <sip:10.0.0.1:5060>.

CSeq: 2 INVITE.

Server: sbc_5.

Content-Length: 0.

.

#

U 10.14.0.1:5060 -> 10.0.0.1:5060

ACK sip:003112345678@10.0.0.1:5060 SIP/2.0.

Via: SIP/2.0/UDP 10.14.0.1;branch=z9hG4bK8e28.642c68037d059634308d4be8fe3f0cdc.0.

Max-Forwards: 67.

To: <sip:003112345678@10.14.0.3:5060>;tag=sbcsipuas_1_C22196_20160314080307791_b59sb10.

From: "+31612345678"<sip:+31612345678@10.14.0.3:5060>;tag=109ac722.

Call-ID: 78100MjY3OGExZmMyODU2MzAyMzM5ODA3MmNhMDdlMzg0MzU.

CSeq: 2 ACK.

Content-Length: 0.

.

#

U 10.14.0.1:5060 -> 10.14.0.2:5060

SIP/2.0 487 Request Cancelled.

From: "+31612345678" <sip:+31612345678@10.14.0.3:5060>;tag=109ac722.

To: <sip:003112345678@10.14.0.3:5060>;tag=sbcsipuas_1_C22196_20160314080307791_b59sb10.

Call-ID: 78100MjY3OGExZmMyODU2MzAyMzM5ODA3MmNhMDdlMzg0MzU.

Contact: <sip:10.0.0.1:5060>.

CSeq: 2 INVITE.

Server: sbc_5.

Content-Length: 0.