Specifications

MyPBX SOHO Administrator Guide
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Figure H-2-4
Allow RTP port range:
Name: RTP
Protocol: UDP
Port: 10000:12000
IP: 110.111.132.6/255.255.255.255
Action: Accept
Figure H-2-5
Note: If the media server of SIP provider is dynamic, and we cannot collect the IP range.
We can allow the RTP range for the whole IP addresss like this: