The IP Office platform comprises 4 models: IP Office - Small Office Edition; IP403; IP406; and IP412. The IP403, IP406 and IP412 platforms can have expansion modules added to them to match the requirements of a growing business. The IP Office - Small Office Edition is a compact platform specifically designed to meet the needs of home offices and very small business.

In a single unit it provides a PABX with capabilities to support Auto Attendant, Voicemail, broadband access, a wireless access point, and VPN tunneling. VCM compression is included as standard to support IP extensions or provide IP trunks back to a head office.

The IP Office - Small Office Edition supports a maximum of 28 extensions; the IP403 supports a maximum of 100 extensions; the IP406 supports a maximum of 180 extensions; the IP412 supports a maximum of 360 extensions.

Avaya IP Office delivers full voice functionality with a comprehensive set of features. The system can be configured as a voice-only PBX using traditional circuit-switched lines or as an IP telephony server using high-speed ISDN/PRI dial-up access and/or direct leased line connectivity.

When acting as an IP telephony server, IP Office supports cost effective standards-based IP telephony (H323), quality of service (QoS) through DiffServ (for routing), 802.1p (when used in conjunction with a Cajun® local area network [LAN] switch), and remote locations connected via Frame Relay.

Voice calls can be allocated dynamically and can -bump- a multi-channel data transmission from one of its channels as needed to help ensure priority voice calls get through.