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Question on MTP in a single Site Cluster

Can someone explain why you would require MTP in the above set up . I understand you need them if you have G711 and G729 sites or you have Unity running in G711 but calls to Unity are across a WAN using G729 so need MTP to make use of the announcements . In our set up all calls are G711- Would you require MTP still. Also our GW`s are MGCP


1. Internal calls In our Unity Connection the install guys configured the Codec`s as G729 and G711ulaw but left G711Alaw as not being associated as a codec. We are in the UK, does it matter that the US version is installed as in CCM you only have the option of g711 not the individual different type of codec`s , only on the GW`s do you have this option

2. External Calls - Our GW`s are configured as G711ALAW for the UK will the codec choice in Unity cause problems?

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