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Registering remote extension using 3CXSBC

Discussion in '3CX Phone System - General' started by obay, Jun 3, 2015.

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  1. obay

    Jun 3, 2015
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    I'm using the free 3CX edition and trying to register a remote Yealink T22P IP phone to my local 3CX system.

    The 3CX is behind a NAT. I've opened ports 5090 and 5000 from the public static IP to the server.

    The remote location has 3CX SCB installed on one of the PCs and it is always on. The setup is behind a NAT also. I can confirm the service is running and the port 5060 UDP is listening.

    I enabled auto provisioning on the IP phone... the settings are picked up correctly. However, after the phone reboots, the registration fails.

    I see the following line in the 3CXSBC logs file:
    ALERT | 20150603-193033.536 | 3CXTunnel | TUNL | 9680 | TunnelTcp.cpp:296 | Sending first packet from [ V4 UNKNOWN_TRANSPORT target domain=unspecified mFlowKey=0 ] to [ V4 TCP target domain=unspecified mFlowKey=0 ]

    (I changed the actual public IP in this line to avoid unnecessary fun)

    Any idea what is wrong here?

    Any help would be appreciated.

  2. IliasL_3CX

    3CX Support

    Jun 2, 2014
    Likes Received:
    Hi there,

    Kindly ensure that you have followed the below guide in order to setup the SBC:

    Best Regards
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