Jut in update
In kamailio case all goes well
Kamailio sets to UAC Record-Route in the 200 reply and then UAC sends ACK via Route sent...

I totally confised...
In both examples from my provider 200 contains Route set but in case of kamailio UAC uses route and in case of provider it uses Contact...

both Route heanders contains "lr"

Provider based Route header jsut contains only sip:ip:port;lr when my testing kamaili regitrar contains sip:ip:port;lr,ftag=fromtaghere

2018-07-02 10:45 GMT+03:00 Yuriy Gorlichenko <ovoshlook@gmail.com>:

Anyway thank you so much for your responses 
I really appreciate your time and your help here

2018-07-02 10:42 GMT+03:00 Yuriy Gorlichenko <ovoshlook@gmail.com>:

Yep this clear for me from the start.

For me for now not clear question  abot direct connect for now.

2018-07-02 10:00 GMT+03:00 Alex Balashov <abalashov@evaristesys.com>:

On Mon, Jul 02, 2018 at 09:59:12AM +0300, Yuriy Gorlichenko wrote:

> That was my point also...
> But they sent me lint to rfc3261 12.1.2 and that confused me
>
> So just for resume:
>
> So am I right if I say that in case If provider receives INVITE with
> Record-Route from my side (myProxy)
> Provider should care about it's own Record-Route and it should have uri
> where myProxy should sent ACK to instead of using Contact in thi case
>
> In case direct conntect UAC -> Provider I still need to use Contact field
> as URI to send ACK to that explained on the 12.1.2 of rfc3261?

If the provider sent you a Record-Route of their own in addition to any
that you have placed there, your UAC must still follow it when
contacting them for in-dialog requests.

--
Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

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