Hi Alex,

Thanks for your reply.

ICE/STUN haven’t been activated by our clients. All transmission traffic pass through a proxy server. Below is the screenshot of a normal call process.

Best Regards,

Rex

-----Original Message-----
From: sr-users <sr-users-bounces@lists.kamailio.org> On Behalf Of Alex Balashov
Sent: Thursday, May 14, 2020 12:18 AM
To: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>
Subject: Re: [SR-Users] Issue of calls drop 32s

It's a tell-tale sign of an end-to-end ACK from the caller not being forwarded properly to the callee. The server should not be forwarding such an ACK "to itself"; this suggests that its Request URI may be improperly constructed (it should be equivalent to the remote Contact URI of the callee in the 200 OK message), or that its Route headers are somehow incorrect (they should mirror the Record-Route set in the 200 OK).

-- Alex

On Wed, May 13, 2020 at 04:07:16PM +0000, Rex Lin (林昱頡) wrote:

> Hi,

> It’s weird that the calls always drop after 32s while the callee is using public ip. Also, Server forwards ACK to itself with UDP, instead of forwarding to callee with TLS.

> Moreover, I cannot see “Received” in AOR as the callee finish the registration.

> I recognized it’s marked by nat_uac_test(“19”) and set with fix_nated_register(), the problem can be resolved.

> My scenario is as below, for your reference.

> 1.Kamailio version is 4.4.7, listening public ip.

> 2.Caller it’s behind NAT.

> 3.Clients of Linphone.

> Do you know the reason why it happened?

> Best Regards,

> Rex

> _______________________________________________

> Kamailio (SER) - Users Mailing List

> sr-users@lists.kamailio.org