Re: [SR-Users] loose_route() with pre-loaded Route in ACK

On 02/29/2012 06:35 PM, Andreas Granig wrote: I'm slowly getting the problem :) When you use the IP address of your kamailio as the domain part (e.g. sip:test@192.168.51.133), then the $ru of the INVITE and of the ACK is exactly that: sip:test@192.168.51.133. What happens in loose_route() is that there is a check called is_preloaded(), which simply checks if there's a To-tag, and if so, returns false back to the config file. However if there IS a To-tag like in the ACK, then is_preloaded() returns false, and it starts checking if $rd:$rp matches one of your sockets, which in this case returns true. Because of this, it assumes that the previous hop was a strict-router, and it sees that the next hop (actually itself) is a loose-router, and because of that it does a rewrite_uri() using the $du to "recover" from that scenario. So it's actually a bit of a special case (using a pre-loaded route and an IP as $rd and a stateless logic), but a quite nasty and still valid one.