Yes, the G729a codec must be installed and the support enabled in the registry or Unity will not indicate a 729a call will be accepted when it attempts to connect to our port. In later versions of the TSP that comes with 3.1(5) and later the 729a support is on by default (without the need for the registry key) but you can still force it to not accept 729a calls at all by putting the key in there with a "0".
Unity will transcode from 711 to 729a or vice versa as necessary depending on the format of the file being played (prompt, greeting, voice name, message) and the connection type established with the call. This isn't normally the source of garbled playback reports, however - it does chew a vew CPU cycles (though not that bad) - installing the 729a prompts will prevent the ranscoding from having to be done.
So no, users will not have to rerecord their greetings and voice names, the proper format will be played out as needed. No, the messages should not be garbled (I suspect other issues are at play here).
Changing the recording format to GSM will result in _all_ recordings being in that format regardless... again, though, Unity will transcode into the proper format of all files during playback depending on the codec established by the incoming call. Same deal with recordings - it'll be transcoded from 711/729a to GSM on the fly. It chews a few CPU cycles and you get some quality loss but not significant on either count.
We have 6608s as gateways. A couple of followup questions:
Do you know if the Engineering special for the 6608 is available for download on CCO or only via TAC?
Are the G729a prompts the ones recommended for use in a mix environment (G711 & G729)? or depending on amount of Xcoding being done? I am trying to decide whether to convert to G729a prompts or keep them G711.
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The short answer is that you don't.... That isn't entirely true while at
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...