Pressing the ? Twice will in fact give u the results your looking for. The region setting on UCM will set the codec that u suoport during call setup on the phone and the system param settings for UCCX set the codec you support for call setup. Thus as long as you have overlapping or at least one of the same codecs supported on both sides of connection the call will be able to setup the rtp connection between each. Pressing ? twice onxe rtp session is established gives you the codec that was negotiated. Keep in mond that the codec will change as different prompts or MOH are transgressed between the UCM and UCCX server.
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