External SIP Trunks

To properly configure an external SIP trunk on the UCx Server, perform the following steps.

STEP ONE:

External SIP trunks that are accessed via a router with NAT enabled, must have the following configured on the SIP Settings page:

1. NAT = Yes
2. External IP selected and configured with the correct external IP address
3. Local Networks properly configured
   Click on Auto Configure to let the system detect and automatically populate the values for External IP and Local Networks.

   

4. Enable Jitter Buffer
   

STEP TWO:

Enable RTP port forwarding on the customer's router.  The RTP port range (default value 10000 to 13999) must be forwarded to the IP address of your UCx Server. See Configure Port Forwarding for Remote Access for details.

STEP THREE:

For peer based SIP trunks (i.e. not registration based) or if remote SIP phones are used, you also need to port forward the SIP signaling port (default value 5060) on the customer's router. See Configure Port Forwarding for Remote Access for details.

STEP FOUR:

Turn OFF SIP ALG on the customer router. See Deployment of UCx in a Network and Unexpected call failures and registration problems for details.

Remote Nortel Phones

If there are remote Nortel phones connecting to the UCx, perform the following steps:

STEP ONE:

Configure the Public IP address of the UCx Server on the Nortel Settings page.

STEP TWO:

Port forward the Nortel phone signaling port (default value 7000) on the customer's router. See Configure Port Forwarding for Remote Access for details.