The card can be fitted with an IP Office 500 daughter trunk card, which uses the 4 RJ45 ports for trunk connections. This card accepts one IP Office 500 trunk daughter card of any type. A maximum of two of these modules are supported on the IP500 Base Unit.

This card provides voice coding channels for use with VoIP calls, SIP trunks and IP-based voice networking. The module supports up to 64 channels. The actual number of channels enabled is controlled by the VCM Channel licenses entered into the IP Office 500 system configuration. This VCM module has 4 VCM channels enabled by default.

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