Product information "VoIP channels incl. VMF COMpact 4000"
Activation of additional VoIP channels for the COMpact 4000. "4 to 8 VoIP channels incl. VMF" must first be activated, only then the extension "8 to 12 additional VoIP channels" can be used. A maximum of 12 VoIP channels can be enabled in the COMpact 4000. The first time you activate a channel, 20 additional voicemail and 20 fax boxes (VMF) are activated. VoIP channels are also used for the VMF functions (max. 1 channel for fax transmission/reception).