To support VoIP trunks and phones, the IP Office system must support with voice compression channels, also known as VCM channels.
For Linux-based IP Office systems, no additional hardware is required.
For IP500 V2 systems, voice compression channels are added to a system using a combination of the following options.
IP500 VCM Base Cards: Installation of up to 2 IP500 VCM base cards. There are 2 types of card are available, the IP500 VCM 32 and the IP500 VCM 64, each providing 32 and 64 VCM channels respectively.
IP500 Combination Cards: Installation of up to 2 IP500 Combination cards. These cards provide a mix of digital extension ports, analog trunk ports and trunk ports. Each card also provides 10 voice compression channels.
The IP Office requires a voice compression channel for:
Incoming and outgoing call setup with the system.
Any call to or from a non-IP trunk or phone.
Any call to or from an IP trunk or phone that is using a different codec than the telephone.
