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Call through gateway from different region

Unanswered Question
Sep 18th, 2006
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we have 3845 router and 2 E1 configured one as H323 and other as MGCP gateway. Both the gateway are in same region( Say A). The phone on the same region ( A ) has no issue in calling through both gateways. But the phone on the other region ( say B) can make call through MGCP gateway only. When i try through H323 gateway rings once and get disconnect automatically. Within the same region codec G711 is used and between the region A and B codec G729 is used.Please, Could any one help me to sort out this issue? Is it because of transcoding issue ? if so why this happenning only with H323 not with MGCP?

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jbouwkamp Mon, 09/18/2006 - 03:17
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Your H323 gateway is probably using the G711 codec only. Your MGCP gateway will support multiple codecs automatically. In the H323 router setup the following:


Router#conf term

Router(config)#voice class codec 99

Router(config-class)#codec preference 1 g711ulaw

Router(config-class)#codec preference 2 g729br8

Router(config-class)#codec preference 3 g729r8

Router(config-class)#end


Then assign that codec class to each VOIP dial peer (incoming call leg):


Router(config)#dial-peer voice 2000 voip

Router(config-dial-peer)#voice-class codec 99


That should fix it


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