We have a scenario where we have a gateway (cisco 2821 with fxo ports) which we have configured in Cisco Call Manager Ver 4.3(1) as a H.323 gateway. We have Cisco CRS application running the icd.aef script. We are able to hear the IVR prompts if we call using a Cisco IP Phone which is on the same LAN however if we call on the gateway we just hear ringing tones. We changed the setting on the gateway just to check if the call was arriving on call manager or not and we routed the call to a Cisco Hardphone extension and we can answer the call and the call is completed. Attached is the configuration for the gateway. If you need any further information please free to contact me.
Below is the debug out for ccapi from the gateway.
This is definately a codec issue. I had the same problem with an IOS H323 Gateway. Do a debug voice ccapi inout to determine your inbound and outbound dialpeers. In my case I had 8 POTS lines with opx 2100 where 2100 matched a voip dial-peer for 21..
The initial problem was that my voip dialpeer explicitly had codec g711ulaw defined. The problem was that the phone that received the re-order tone was set to use g729 between regions.
This is the fix:
voice class codec 1
codec preference 1 g711ulaw
codec preference 2 g729br8
codec preference 3 g711alaw
codec preference 4 g729r8
dial-peer voice 2100 voip
voice-class codec 1
session target ipv4:x.x.x.x (IP of CCM)
incoming called-number .
Create a codec voice-class and assign the class to your voip dial-peer so that it can choose the best codec depending on what the endpoint is trying to negotiate.
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