Hi All, am tasked by my boss to setup an IP PBX using GXW4104 gateway and 4 normal PSTN lines for the company. Have finally managed to get the internal calls working with audio but am currently stuck with calls coming in from and going out to the gateway. Managed to make calls to and received calls from the external lines but there are no audio heard on both ends. Not sure if this will help but hope this reporting below from the Server Status helps. MediaServerReporting::RTPReceiver C:2:1 No RTP packets were received:remoteAddr=0.0.0.0:1600,extAddr=0.0.0.0:0,localAddr=x.x.x.x:7002 MediaServerReporting::RTPReceiver C:2:2 No RTP packets were received:remoteAddr=x.x.x.x:9028,extAddr=0.0.0.0:0,localAddr=x.x.x.x:7004 **where x.x.x.x = 3cx server IP. Any help on this will be deeply appreciated.