[SR-Users] tm response issue

[Klaus Darilion]

Hi!

Kamailio does not forward the received 503 response but instead 
generates a new 500 response. Failure routes are not activated.

U 2010/04/14 15:08:26.201865 83.136.22.111:5060 -> 83.136.32.159:5060
SIP/2.0 503 Service Unavailable
Via: SIP/2.0/UDP 
83.136.32.159;branch=z9hG4bK2a5a.0d5ea987.0;received=83.136.32.159
Via: SIP/2.0/UDP 
10.10.0.51:5086;received=83.136.33.3;rport=5086;branch=z9hG4bK2901533893
From: <sip:klaus.darilion at labs.nic.at>;tag=1939498352
To: <sip:01888801505641636 at labs.nic.at>;tag=as1b74528e
Call-ID: 3387977514
CSeq: 21 INVITE
Server: Asterisk PBX 1.6.2.6
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Content-Length: 0
X-Asterisk-HangupCause: Unallocated (unassigned) number
X-Asterisk-HangupCauseCode: 1

U 2010/04/14 15:08:26.201865 83.136.32.159:5060 -> 83.136.22.111:5060
ACK sip:01888801505641636 at labs.nic.at SIP/2.0
Via: SIP/2.0/UDP 83.136.32.159;branch=z9hG4bK2a5a.0d5ea987.0
From: <sip:klaus.darilion at labs.nic.at>;tag=1939498352
To: <sip:01888801505641636 at labs.nic.at>;tag=as1b74528e
Call-ID: 3387977514
CSeq: 21 ACK
Max-Forwards: 69
Content-Length: 0


#
U 2010/04/14 15:08:26.201865 83.136.32.159:5060 -> 83.136.33.3:5086
SIP/2.0 500 Service Unavailable
Via: SIP/2.0/UDP 
10.10.0.51:5086;rport=5086;branch=z9hG4bK2901533893;received=83.136.33.3
From: <sip:klaus.darilion at labs.nic.at>;tag=1939498352
To: 
<sip:01888801505641636 at labs.nic.at>;tag=c3829fdbb3bfc7416671e56cae8e633d-a9b5
Call-ID: 3387977514
CSeq: 21 INVITE
X-Info: (83.136.32.159:1035) Enforcing NAT traversal for local caller
X-Info: (83.136.32.159:1035) Enforcing symmetric response routing
Server: kamailio (3.0.1 (i386/linux))
Content-Length: 0

Is this a feature or a bug?

thanks
klaus