1. How are calls transcoded from G711 to G729 in a CCM environment (with remote sites separated by regions) when I do not have any transcoders configured in CallManager? CCM must be transcoding behind the scenes somewhere. Is this a non-configurable CCM software resource... or are my PVDM's on the gateways somehow being tapped even though I don't have DSP farms setup...or are the phones doing the transcoding?
2. I have a 2801 gateway with an ISDN PRI that is controlled by CCM. The calls obviously need to be converted from TDM to VoIP. Is the process of converting from TDM to VoIP configurable? I do not have a DSP farm on this gateway but it does have a PVDM installed. So I guess my question is: do all I need to do is physically install a PVDM and that?s it?
3. Can a 2801 router provide transcoding services when neither CME or CCM are involved?
For example this is the design: non-Cisco PBX -> G711 SIP trunk -> Cisco 2801 -> G729 SIP (over a WAN) -> Cisco 2801 -> G711 SIP Trunk -> non-Cisco PBX
Both routers have PVDM's but the question is do I need a "DSP Farm", and if I do, can the DSP farm be setup without CME or CCM controlling it? When you setup a DSP farm you usally need to specify the "applacation" which is usally sccp which would indicate the CCM or CME needs to be involved.