The ACK is stopping at Kamailio.
Be sure that you have loose_route management in kamailio script and that the ACK is hitting it.
Something like

if (loose_route()) { 
        xlog("L_ERR", "route[MAIN]: call-id=$ci from=$fU to=$tU : attempt to route with preloaded Routes"); 
        if (is_method("ACK")) 
            t_relay(); 
        exit; 
}

Regards,

Federico

On Thu, May 28, 2015 at 3:36 PM, Ali Taher <ataher@vanrise.com> wrote:
Hi,

Kindly find attached requested trace with record_route set.

Kamailio:192.168.110.181
Client: 192.168.26.3
Gateway:192.168.26.4

Regards,
Ali

-----Original Message-----
From: sr-users [mailto:sr-users-bounces@lists.sip-router.org] On Behalf Of Alex Balashov
Sent: Thursday, May 28, 2015 4:22 PM
To: Ali Taher
Subject: Re: [SR-Users] Kamailio not receiving BYE request

‎Can you provide a packet capture of this scenario, from the reference frame of the Kamailio server?

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

Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

Sent from my BlackBerry.


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