Hello,
I am currently working on a scenario where I need to use Kamailio in the
failure_route to process SIP responses, specifically handling negative SIP
replies (e.g., 486 Busy Here) that Kamailio may receive.
Here is the topology:
##B2BUA (acts as a UAC with the Kamailio, because it sends the INVITE) ->
Kamailio -> Callee##
In my setup, Kamailio needs to extract all Via headers from the received SIP
response in the failure_route, focusing particularly on the bottom Via header
(from the B2BUA' UAC part). However, I am encountering difficulties in
achieving this. Here is what I have tried so far:
1. To extract the Via headers, I used the following line of code in the
failure_route:
```$var(viaHeaderValues) = $T_rpl($hdr(Via));```
However, this only returns the topmost Via header.
2. I attempted to get the first and last Via headers values with:
```$var(viaHeaderValueFirst) = $T_rpl($hdr(Via)[0]);
$var(viaHeaderValueLast) = $T_rpl($hdr(Via)[1]);```
Unfortunately, this also only returns the topmost Via header, which contains
the address of Kamailio.
My goal is to make sure that when Kamailio sends the SIP reply to the UAC with
send_reply method on the failure_route, it uses the extracted *Via header* of
the incoming SIP response (only the bottom one). Here is an example scenario:
- Received SIP Response in kamailio:
```
SIP/2.0 486 Busy Here
Via: SIP/2.0/UDP
200.200.200.4;branch=z9hG4bK9157.090080a91105c0ec6279bb56882d1dc8.0
Via: SIP/2.0/UDP
200.200.200.3;received=200.200.200.3;rport=5060;branch=z9hG4bKF1aaZ7ea7yc2m
From: <sip:[email protected]>;tag=222222
To: <sip:[email protected]:5060>;tag=4545454
Call-ID: [email protected]
CSeq: 1 INVITE
Content-Length: 0
```
- Desired SIP Response from kamailio:
```
SIP/2.0 486 Busy Here
Via: SIP/2.0/UDP
200.200.200.3;received=200.200.200.3;rport=5060;branch=z9hG4bKF1aaZ7ea7yc2m
From: <sip:[email protected]>;tag=222222
To: <sip:[email protected]:5060>;tag=4545454
Call-ID: [email protected]
CSeq: 1 INVITE
Content-Length: 0
```
The current issue is that Kamailio modifies the Via header when sending the
reply with send_reply method, resulting in:
```
SIP/2.0 486 Busy Here
Via: SIP/2.0/UDP
200.200.200.3;rport=5060;branch=z9hG4bKF1aaZ7ea7yc2m;received=200.200.200.3
From: <sip:[email protected]>;tag=222222
To: <sip:[email protected]:5060>;tag=4545454
Call-ID: [email protected]
CSeq: 1 INVITE
Content-Length: 0
```
Due to this change, the UAC does not correctly react to or understand the SIP
response "SIP Reply follows the RFC standards, but my current UAC waits for a
Via that looks like Via of the previous SIP messages in the structure of
parameters.". It is crucial for the Via header to maintain the same important
order such as the branch, received, and rport values as the previous exchanged
SIP messages.
Could you please provide guidance on how to force Kamailio to send the SIP
reply using send_reply method with the extracted bottom Via header from the
incoming SIP response? Any advice or examples on handling this situation would
be greatly appreciated.
Thank you for your time and assistance.
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