Hi all,
I have an issue with asterisk 13 and pjsip. I guess it is somehow Firewall related, but I'm unsure.

A registration to Sipgate is established successfully:

<Registration/ServerURI..............................> <Auth..........> <Status.......>

 pjsip_sipgate/sip:sipgate.de:5060 pjsip_sipgate     Registered

Calling the registered number is even successfully shown in asterisk (it is a freepbx installation). But when doing a second call the number is busy ("provider" busy, I don't see anything in asterisk verbose mode).
Sending a pjsip unregister results in the following messages:

[2016-10-15 10:03:22] WARNING[10162]: res_pjsip_outbound_registration.c:761 schedule_retry: No response received from 'sip:sipgate.de:5060' on registration attempt to 'sip:263614...@sipgate.de:5060', retrying in '60' -- Contact pjsip_sipgate/sip:263614...@sipgate.de:5060 is now Reachable. RTT: 434.393 msec
  == Endpoint pjsip_sipgate is now Reachable

so it is somewhat clear, why i get a busy, because the endpoint is not reachable. But WHY is the endpoint not reachable?

Regarding the architecture: I have two routers cascaded, that is unfortunately necessary. On the first router (vDSL-access router) I have forwarded nearly everything to the second router (Bintec rj 353), where a port forwarding for relevant ports (sip and pjsip (udp and tcp), rtp (udp)) is configured. IF a call goes through, nearly everything is working (audio only incoming, but that is another issue).

STUN is configured. FreePBX Firewall is disabled.

Kind regards,

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