First SIP-registering Succeeds, Second Doesn’t

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Hi all, I have a strange issue, with a some kind complicate architecture… A router of our internet provider is in front of another bintec rs353j router, at which my freepbx installation is located. However, NAT etc. seems to work fine. BUT: Something is not working…:
When registering my sip-trunk towards my provider (3 different providers, all behave comparable), everything works at first. Calls are possible. But after some time, when the next REGISTER happens, the answer of my provider is sent towards the wrong port. My freePBX listens on 55060, where the first registration request are answered as they should. in the second registration request wrong ports are used. besides this, Header “Expires” is set to “0” and no “Allows” are listed…

Good case:
2017/02/10 20:40:59.236563 192.193.194.99:55060 -> 217.10.79.9:5060
REGISTER sip:sipgate.de:5060 SIP/2.0
Via: SIP/2.0/UDP
99.88.77.66:55060;rport;branch=z9hG4bKPj7d031cfc-7602-4ac1-a264-bcf8d267500b From: sip:custumoerIDe0@sipgate.de;tag

3 thoughts on - First SIP-registering Succeeds, Second Doesn’t

  • Some further information:
    asterisk version: 13.13.1, pjsip (pjproject) 2.5.5

    regards, andre

    Am 13.02.2017 um 17:32 schrieb Andre Gronwald:

  • –Apple-Mail=_4799DA1B-A547-4EE4-8ED7-154B6581DBBE
    Content-Transfer-Encoding: 7bit Content-Type: text/plain;
    charset=us-ascii

    +1! This sounds an awful lot like an ALG doing it best to ‘help’…

    –Apple-Mail=_4799DA1B-A547-4EE4-8ED7-154B6581DBBE
    Content-Transfer-Encoding: quoted-printable Content-Type: text/html;
    charset=us-ascii


    +1! This sounds an awful lot like an ALG doing it best to ‘help’…



    On 14/02/2017, at 6:38 am, Israel Gottlieb <isrlgb@gmail.com> wrote:


    Disable all sip alg/helpers in the router



    –Apple-Mail=_4799DA1B-A547-4EE4-8ED7-154B6581DBBE