These are used to provide voice compression channels for calls between IP and non- IP devices, devices being both trunks and extensions. VCM cards with differing numbers of voice compression channels are available.
VCM5, VCM10, VCM20 These VCM cards have been superseded by the VCM4, VCM8 and VCM16 versions. Though the new cards have a lower channel capacity, they support echo-cancellation of 64ms rather than the formers 25m to maximize speech quality.
Note:The Voice Compression Module (VCM) is used for Voice over IP (VoIP) applications in the IP406 and IP412 control units. Five VCM variants are available supporting 4, 8, 16, 24 and 30 channels of compression. On IP Office – Small Office Edition systems, either 3 or 16 VCM/VoIP channels are pre-built. The IP406 supports a single VCM while the IP412 can have any two VCMs installed. The echo cancellation capabilities of the VCM’s vary. The VCM 4, 8, 16 and 24 offer 64ms of echo cancellation. While the VCM 30 offers 25ms.

Avaya IP Office Internal Daughter Cards are fitted inside the base module of the IP403, IP406 and IP412 platforms and add voice compression or modem features that allow businesses to easily and quickly extend Voice over IP (VoIP) resources and remote access benefits to a growing number of users The VCM 5 Expansion Kit is a 5 Channel voice compression module required for IP trunking and IP extensions

Avaya IP Office Internal Daughter Cards are fitted inside the base module of the IP403, IP406 and IP412 platforms and add voice compression or modem features that allow businesses to easily and quickly extend Voice over IP (VoIP) resources and remote access benefits to a growing number of users The VCM 10 Expansion Kit is a10 Channel voice compression module required for IP trunking and IP extensions.

Avaya IP Office Internal Daughter Cards are fitted inside the base module of the IP403, IP406 and IP412 platforms and add voice compression or modem features that allow businesses to easily and quickly extend Voice over IP (VoIP) resources and remote access benefits to a growing number of users The VCM 10 Expansion Kit is a10 Channel voice compression module required for IP trunking and IP extensions.

Avaya IP Office Internal Daughter Cards are fitted inside the base module of the IP412 platform only to add voice compression or modem features that allow businesses to easily and quickly extend Voice over IP (VoIP) resources and remote access benefits to a growing number of users The VCM 30 Expansion Kit is a add on 30 channel voice compression module required for IP trunking and IP extensions. Maximum of 2 modules (60 channels) on IP412.