This type of feature key is used with IP500 V2 control units and is a mandatory item. The control unit must be fitted with one of these feature keys even if no licenses are being used.

• Software: IP Office Version
• Format: Mu-Law
• This type of feature key is also a memory card used for other system functions and to provide embedded voicemail if required.
• By default, the card can be used for 2 ports of embedded voicemail. Additional ports up to a maximum of 6 can be enabled by the addition of licenses.
• The voicemail mailbox message and prompt capacity is limited to 15 hours regardless of the card capacity.