The IP400 VCM 30 is an 30 channel voice compression module required for IP trunking and IP extensions, 25ms echo cancellation. Will only work on Release 2 of IP Office

The IP406 supports a single VCM module while the IP412 can have any two VCM modules installed. On IP Office - Small Office Edition systems, either 3 or 16 VCM/VoIP channels are pre-built into the unit.

Product also known as: