Ports required for SIP Trunking
Posted by on 14 May 2011 07:45 PM

The ESI Hosted Services SIP trunks deliver calls to your PBX on the standard SIP port number 5060 on UDP.

If your PBX sits behind a firewall/router (the most likely case) and has an internal NAT address of,, or, you will need to make sure you have port 5060 UDP forwarded in your firewall/router to your PBX's internal NAT address.  Most firewall/routers support port forwarding.  See your firewall/router's documentation for information on how to setup port forwarding.

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