Part Number 700426224, the Avaya IP500 Office Server 30 additional Handset Expansion Module, purchasing

 

 This module provides for up to 30 additional analog telephone interfaces:

 Two Wire

 DTMF signaling (No rotary or Loop Disconnect)

 Time Break Recall (No Earth Loop Recall)

 Caller ID capable

 Message Waiting Indication (MWI) capable - High Voltage, Pulsed High Voltage, Line Reversal

 IP Office Phone Modules provide support for a variety of analog MWI (Message Waiting Indication) methods. These methods are 51V Stepped, 81V, 101V and Line Reversal. The 101V method is only supported when using a Phone V2 expansion module.

 Each analog port can support a device of maximum 1 REN.

 On analog ports, call information is sent while the phone is ringing, and cannot be updated during a call or set on an outbound call (the phone may do a local match but this is not controlled by the IP Office). The primary purpose of displays is to give information about incoming calls. Where the Caller Display standard chosen supports the delivery of text (extension name) as well as the number, both are delivered.