[SR-Users] Kamailio not receiving BYE request

[Alex Balashov]

Hi Ali,

I was unable to open your client trace, but the Kamailio trace worked:

client-trace.pcap:   pcap-ng capture file - version 1.0
kamailio trace.pcap: data

Anyway, looking at the Kamailio trace, you will see that the BYE is 
going straight from 192.168.26.3 (client) to 192.168.26.4 (gateway), 
bypassing Kamailio.

This is the normal, default behaviour for a proxy. A BYE is a kind of 
request called a sequential request, which means it occurs within a 
dialog. After the initial INVITE transaction is set up through the 
proxy, sequential requests such as end-to-end ACKs, BYEs, reinvites, 
etc. flow directly between the endpoints, using the network and 
transport-layer reachability information in their respective Contact 
headers.

If you want these sequential requests to traverse Kamailio, you must add 
a Record-Route header to the initial INVITE before forwarding it. This 
tells the two endpoints to pass sequential requests through Kamailio as 
well:

    if(is_method("INVITE")) {
       ...

       record_route();

       ...

       if(!t_relay())
          sl_reply_error();
    }

-- Alex

-- 
Alex Balashov | Principal | Evariste Systems LLC
303 Perimeter Center North, Suite 300
Atlanta, GA 30346
United States

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