No outbound calls from a telephone / very early stage - not yet a dialplan problem

Hello everyone,

I’m not able to initiate calls from a telefone to my freepbx installation (FreePBX 13.0.1beta3.33).

Setup:
FreePBX box is somewhere at the internet, the telephone is in an office with a private IP range.
The connection between teelephone ↔ FreePBX goes over a vpn connection (OpenVPN).

Status:
The telephone registers without any problems at the FreePBX box.
The telephone can receive calls from the outside thrue the FreePBX box.
Therefore I think I can exclude mtu or routing problems .

Log messages:
Trying to do a call gives me just this 6 lines of log.

[2015-07-27 12:52:15] DEBUG[21743]: res_pjsip_endpoint_identifier_ip.c:128 ip_identify: No identify sections to match against
[2015-07-27 12:52:15] DEBUG[21743]: res_pjsip_endpoint_identifier_user.c:104 username_identify: Retrieved endpoint 200
[2015-07-27 12:52:15] DEBUG[21743]: res_pjsip_nat.c:56 handle_rx_message: Re-wrote Contact URI host/port to 192.168.xxx.xx:2048
[2015-07-27 12:52:15] DEBUG[21743]: res_pjsip_endpoint_identifier_ip.c:128 ip_identify: No identify sections to match against
[2015-07-27 12:52:15] DEBUG[21743]: res_pjsip_endpoint_identifier_user.c:104 username_identify: Retrieved endpoint 200
[2015-07-27 12:52:15] DEBUG[21743]: res_pjsip_nat.c:56 handle_rx_message: Re-wrote Contact URI host/port to 192.168.xxx.xx:2048

No ideas anymore…
Regards
Robert

This is not Beta related!
It seems to be a Hardware Problem with the used phone - snom360, FW: SIP 8.7.3.25.

The same issue exists with the current stable version.
With a softphone (X-Lite) its works without any problems.

regards
Robert