I'm studying CIPT and I was exactly in same the same case than you about MTP, sometimes it can be very very difficult to understand what the autor meant because they don't give any example at all. Last week I manage to find an explanation :
for example when I user or a phone receive a call that come from an H323 gateway,, it's not possible to transfer the call to another phone because some old version of H323 gateway can't handle it.
so with MTP, when the user press the transfer button, the call is caught automatically by MTP, so with MTP you can stock the active call in memory while the user is doing the transfer. this is true with other services also HOLD ...., new versions of H323 don't need MTP, as they support natively this service.
So we can see MTP as a little "room" when calls are parked while we are handling or using a feature such as call HOLD, TRANSFER ...
as far I know this concern only H323, not sccp ... could someone confirm ??
You are right, its only required for h323 based devices that doesnt support empty capabilities set. The server itself supports software based MTP for integrations such as an Intercluster trunk to another callmanager, ICT to CME systems etc. You may want to check the MTP option under the trunk setup to enable supplementary services such as hold, transfer etc.
When any other codec other than g711 is involved, Cisco's software based MTp services on callmanager will not help. For g729 support, you will have to rely on a hardware based MTP which is nothing but a transcoder.
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