Voicemail Pro Licenses
The actual number of ports available on Voicemail Pro is controlled by license keys entered through the Manager application. See License Keys.
The IP Office may support a higher number of data channels. The figures shown above are the maximum that can be simultaneously used for voicemail operation.
Though linked to the IP Office via a LAN connection, voicemail does not use VoIP VCM channels. The Voicemail Server is seen as a device on the IP Office's TDM telephony interface.
Calls to/from voicemail involving non-IP trunks and extensions do not use VCM channels.
Calls to/from voicemail from IP trunks and extensions do use a VCM channel.