The IP Office 500 also differs from the IP406 V2 by providing a greater trunk expansion capability of up to four PRI interfaces (maximum 96/120 trunks). The IP Office 500 is a stackable unit with an optional 19" rack mounting kit and an optional wall mounting kit for smaller configurations.

The IP Office 500 includes:

   • 4 slots to house a mixture of extension cards and VCM cards
   • Digital Station 8 card
   • Phone 2 and Phone 8 cards
   • VCM-32 and VCM-64 cards
   • Optional trunk daughter card support
   • Analog Trunk Module 4 card
   • BRI-4 and BRI-8 cards (2 x 2B+D and 4 x 2B+D channels respectively)
   • Support for IP400 trunk and VCM cards using a Legacy Card Carrier
   • Support for up to 8 IP Office Expansion Modules (requires upgrade to Professional Edition)
   • Phone modules (8, 16, 30)
   • Digital Station modules (16, 30)
   • Analog Trunk Module 16
   • So8 module
   • External O/P socket supporting two relay on/off switch ports, e.g. for door entry systems
   • Audio input port for external music on hold source.
   • 48 Data channels
   • Up to 30 Voicemail Pro ports
   • Two 10/100 switched Ethernet ports (Layer 3)

IP Office Standard Edition
By default the IP Office 500 control unit runs a subset of full IP Office functionality called IP Office Standard Edition. In this mode the IP Office 500 is restricted to a maximum of 32 users in the base control unit with no expansion. Embedded Voicemail, PhoneManager Lite/Pro/PC Softphone, SoftConsole, TAPI, SMDR and CBC are supported, as well as SIP trunking (through optional licenses) and IP DECT. IP Office Standard Edition does not support voice networking (H.323 or SCN) or advanced applications (Voicemail Pro, CCC, Conference Center, etc).

IP Office Professional Edition
By purchasing the upgrade license from Standard Edition to Professional Edition, additional functionality is enabled. This includes the ability to expand the system using up to eight external Expansion Modules, allowing the IP Office 500 to support a maximum of 272 phones through a mixture of analog, digital or IP handsets. If additional analog trunks are required, these can be aggregated in groups of 16 on each analog expansion module. Note that the Professional Edition also enables the licensing of advanced applications such as Voicemail Pro.