When considering Expansion or Server planning from a media perspective it is important to note that communication with any other IP Office Server Edition component will use VoIP and hence is limited by the media, IP Office Line (SCN trunk) and VCM capacities. This includes:

• Calls to/from Primary/Secondary and other Expansions

• Call recording - one VoIP channel per recorded call. Destination is the location of the active Voicemail Pro.

• Auto Attendants/IVR - one VoIP channel per call when connected to the Auto Attendant/IVR. Destination is the location of the active Voicemail Pro.

• Conferencing when the conference focus is not the local system - one VoIP channel per local member

• Local conferences involving remote users - one VoIP channel per remote member when connected to the conference

• Voicemail leave and collect - one VoIP channel per VM caller when. Destination is the location of the active Voicemail Pro.

• Announcements - one VoIP channel per call when generating announcements. Destination is the location of the active Voicemail Pro.

• Centralized Music on Hold – one VoIP channel per central MOH source when playing to held calls. Destination is the location of the Music on Hold source.

For all VoIP connections between systems, the codec used will be according to the IP Office Line settings of those two nodes.

Consideration should also be given to intermediate destinations to ensure adequate capacity is present. For example a consultation call will open a secondary channel for the consultation whilst keeping the initial call connected.

Lastly, any call on the IP Office Line will take into consideration administered channel limits and Call Admission Control (CAC) if active. Please refer to the CAC section of the IP Office administration documentation for behaviors when CAC limits are exceeded.