Hi
You only need dedicated transcoders when you need to run G729 from a device that supports G729 to one that doesn't (e.g. some application servers - Unity, IPCC etc.)
As your gateway (assuming it's an IOS gateway) will support g729, you just need to ensure it has sufficient DSP capacity.
You have PVDM2 modules in the modern gateways, for example if you have a 24-channel T1 you may have a PVDM2-32 equipped. This has 32 channels of DSP, and each G711 call will take one DSP channel. A g729 will take two.
If you equip twice as many channels of DSP as you have available channels on the PSTN, you should be fine.
If you want further help post a show diag/sh run.
Regards
Aaron
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Aaron
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