[SR-Users] Forcing outbound transport to TCP

[Ivan Ribakov]

Thanks Daniel!

route[RELAY] section is what I’ve been looking for! 
I knew about t_relay_to_tcp() function but placing it directly in the end of “request_route” block lead to undesirable behaviour which made me think it’s not what I needed.

> On 28 Sep 2018, at 10:40, Daniel Tryba <d.tryba at pocos.nl> wrote:
> 
> On Fri, Sep 28, 2018 at 10:07:09AM +0200, Ivan Ribakov wrote:
>> In a basic scenario of one2one call, I was able to make Kamailio to forward INVITE to callee over TCP by issuing a REGISTER request with ???transport=tcp??? parameter. Although it worked, as far as I understand that means all communication with the callee will be happening over TCP. I would like to be able to change transport dynamically so looking for a way to do that from config file.
> ...
>> Any pointers as to how can I modify the outbound message transport? Do I need to use some extra modules or can it be achieved with a basic setup?
> 
> You can do this by explicitly calling t_relay_to_tcp() instead of
> t_relay().
> 
> For example I modified route[RELAY] for a specific destination that
> wants TCP for large INVITEs.
> 
> if($avp(dispatcherid)=="1" && $ml>1249)
> {
> 	if(!t_relay_to_tcp())
> 	{
> 		if(!t_relay())
> 		{
> 			sl_reply_error();
> 		}
> 	}
> }
> else
> {
> 	if(!t_relay())
> 	{
> 		sl_reply_error();
> 	}
> }
> 
> 
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