Audio / media traffic flows through various gateways within Simtex, hence if you are having issues with one-way or no-way audio/media you may need to open up UDP traffic from Simtex media servers.

Signalling – UDP Port 5060

Media – UDP Ports 10000 through 20000

203.32.124.160/27
203.30.19.0/24
202.74.176.160/28
202.74.176.176/29
203.7.224.128/27
 

Posted in: SIP Trunks