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Thread: Can't Receive Incoming Call

  1. #11


    Detected connection type: Port Restricted Cone NAT (external IP: 203.XXX.XXX.XXX:44037).

  2. #12


    Thats not good... you might want to look into your firewall settings that provides your internet.


  3. #13


    So I have re-requested port forwarding to be open....
    TCP - 5060
    UDP - 5060
    UDP 4569
    TCP & UDP 3478
    UDP 6000-60100

    When I make an outgoing call it drops out and disconnects after about 20 seconds... I still can not get an incoming call.

    I know I can telnet to the TCP ports to check they are open from a public IP address, however I am not sure how to test the UDP ports to ensure they are open.

    Any help?

  4. #14


    Freeware tool for testing udp..


  5. #15
    Quadro Architect
    Join Date
    Jun 2006
    Around myself


    If the ports are forwarded correctly, you should see on the SIP Registration Status:

    Detected connection type: Full Cone NAT (external IP: 203.XXX.XXX.XXX:5060).

    Is that the case?

  6. #16


    Hi davrays,

    Detected connection type: Full Cone NAT (external IP: 203.XXX.XXX.XXX:44037).

    I know 44037 is a port, why would this be different to 5060?

  7. #17


    It is possible that the port 5060 is not available.

    Larry, Curly and Moe

  8. #18


    I don't get the Larry, curly and moe bit... but i'll let you have your candy.

    I can telnet into 5060 from the WAN side, so I am fairly confident this is correct.

  9. #19


    Ok when you telnet into the port 5060 where does it take you to do you see the Epygi responding? Do you see that on the logs...

    Has the firewall on the epygi been turned off completely to test if it is a rule that had been applied.. ?

    Have you changed the sip port on the Epygi at all ?

    What happens to the registration and call when you use TCP instead of UDP ?



  10. #20
    Quadro Architect
    Join Date
    Jun 2006
    Around myself


    I would suggest to forget about TCP for now. Almost all ITSPs are working with UDP only, so lets understand UDP.
    timmeah, which port on the router did you use to forward the traffic to port 5060 of the Quadro? Did you explicitly specify the 44037 port on router to port-forward the traffic to QiadrosIP:5060? It is better not to use port translation, and forward the traffic directy to the same port on the Quadro. At least this will create less problems.
    If 5060 cannot be used, you can change the SIP UDP port on Quadro to something like 5080, and portforward the <YourRouterIP>:5080 to <QuadrIP>:5080. In that case you should see: Full Cone NAT (external IP: 203.XXX.XXX.XXX:5080), which will indicate that port forwarding is done correctly.

    For now I doubt the port forwarding in router is done the right way...

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