I got a call on Friday asking if I knew anything about this type of routing.
A quick look around my manuals and deployed devices and I could not find any reference to routing TEL to TEL, since the only routing in the configuration interfaces reference IP – TEL and TEL – IP routing.
A quick internet search and I found myself scanning the Mediant 1000 MSBG End User manual. For anyone looking for this information, here is a quick summary, since I could not find anything on the NET:
This is taken from the manual, available here: http://www.audiocodes.com/filehandler.ashx?fileid=819591
9.12.3 PSTN Fallback
The PSTN Fallback feature enables the device to redirect PSTN originated calls back to the
legacy PSTN network if a destination IP route is unsuitable (disallowed) for voice traffic at a
specific time. To enable PSTN fallback, assign the device’s IP address as an alternative
route to the desired prefixes. Note that calls (now referred to as IP-to-Tel calls) can be rerouted
to a specific Trunk Group using the Routing parameters (refer to ”Configuring the
Inbound IP Routing Table” on page 163).
To configure inbound IP routing rules:
1. Open the ‘Inbound IP Routing Table’ page (Configuration tab > VoIP menu >
Protocol Configuration > Routing Tables > IP to Trunk Group Routing).
So basically, point your TEL-IP calls to the mediant, and you can route them back va IP-TEL again, if need be.
If my logic is correct here, in cases where you are trying to not fall back to this connection but rather use this as a rule, you would then merely point to the mediant’s IP as the destination for TEL-IP and the source for IP-TEL.
Thanks go to Justin for posing the question and leading me to this information. 🙂