The Avaya IP500 Combination Card has four analog trunk ports, six digital station ports, and two analog station ports. This card has up to 10 VCM channels.
Version 2 Compatibility:
Digital station ports: Avaya 1400, 2400, 5400, and 6400 series digital telephones
IP500 V2 control unit running IP Office release 8.1 or higher
Not compatible when running in Essential Edition - Partner version mode.
Version 2 adds:
Compatibility for IP Office 8.1 Feature Pack 1 or higher.
9500 Digital phone series support for digital station ports
Impedance matching to trunk characteristics
Improved echo reduction
Reduction of occasional noise