Hi,

I strongly suggest to look into the opensips logs and see what opensips try to do with the call. Based on your saying (that you see a timeout), I suspect your OpenSIPS tries to deliver the call over TCP to a destination which does not listen on TCP. If you do not know hoe to interpret the logs, run opensips in debug=4 mode, upload the logs corresponding the INVITE execution and provide the link.

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com

On 31.01.2016 16:28, Nabeel wrote:
Without using alias=domain.com <http://domain.com>, TCP still does not work. My initial request for someone to test this using Linphone remains. Please test and let me know if you can call using TCP with OpenSIPS listening on an IP address.

On 31 January 2016 at 09:28, Nabeel <[email protected] <mailto:[email protected]>> wrote:

    On further testing, using the IP address instead of the domain
    name in the URI setting of Linphone works with TCP, so I think
    this might be to do with SRV/NAPTR records associated with the domain.

    On 31 January 2016 at 08:29, Nabeel <[email protected]
    <mailto:[email protected]>> wrote:

        Hello,

        There seems to be a problem with calls over TCP using
        Linphone, and since Linphone is a popular open source
        application, I would like someone to please verify this
        problem. Calls work fine with Linphone over UDP, but after
        registering with TCP using the same credentials, calls do not
        connect at all and lead to a request timeout. A request
        timeout does not say much about the cause, but in this case I
        suspect there is something wrong with TCP on the server side.
        I would like someone to please install Linphone on your phone
        and connect to your OpenSIPS server using UDP and TCP.  Please
        report here if the calls work over both transports.





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