4 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 4 Expansion Kit is a add on 4 channel voice compression module required for IP trunking and IP extensions.

Includes 64ms echo cancellation

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