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) and remote access benefits to a growing number of users.

The Voice Compression Module can be utilized for Voice over IP (VoIP) applications in all IP Office platforms (including the IP401). Four variants are available supporting 5, 10, 20 and 30 channels of compression. The 30-channel variant is supported by the IP412 only. Up to two CMSs can be fitted to the IP412, but all other IP Office platforms support only a single VCM. VCMs are mandatory for all VoIP applications.

The integral dual V.90 (56kbps) digital Central Site modem card, allows termination of two simultaneous Analog modem calls. These calls are presented over a digital BRI or PRI bearer. The IP400 Office Modem 2 Module is supported on the IP403, IP406 and IP412 platforms.

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