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  1. telecom7

    i think its a firewall issue...

    You may also consider opening the following ports in your router. Port 7 Echo 3478 => SIP UDP Port used for STUN requests from the IP Office to the SIP provider. 5060 <= => SIP UDP/TCP* SIP Line Signaling 49152 to 53247* <= => RTP/RTCP UDP Dynamically allocated ports used during VoIP calls...

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