Voicemail or Auto-Attendant or IVR

Last Updated : Mar 17, 2025 |

Leaving a voicemail for a user or hunt group uses one licensed voicemail channel and consumes one from the indirect media call capacity of the Voicemail Pro server.

  • If the endpoint is remote, an IP Office Line (SCN trunk) channel is used.

  • If the source of the call is digital/analog, a VCM channel is also required.

A voicemail collect operation uses the same resources as voicemail leave. Invoking an Auto Attendant, Announcement or IVR script uses the same resources as voicemail, and is taken from the same pool of licenses and voicemail channel capacity; one active Auto Attendants/IVR/Announcement takes one channel and license.

The total solution voicemail channel capacity is determined by a number of factors:

  • The number of per-server supported voicemail channels:

    Server

    Maximum Voicemail Channels

    Dell R660/Virtual

    250

    Dell R260

    75

    IP500 V2

    40

  • If dual Voicemail Pro feature is active (IP Office Select and IP Office Subscription only) – this doubles the maximum capacity to 500 channels.

  • The number of licensed voicemail channels: Each active master Voicemail Pro must have its own licenses. It inherits the other set when active as a backup.

  • Call recording also uses licensed voicemail channels. One active recording channel consumes one voicemail/AA channel.

Dual Voicemail Server Operation

When the dual Voicemail Pro feature is active (IP Office Select and IP Office Subscription only) and not under failover conditions, users are provided voicemail services (voicemail, announcements, call recording, auto attendant, IVR, etc) services from one of the Voicemail Pro servers:

  • All Primary users’ voicemail invocations are directed to the Primary Voicemail Pro instance.

  • All Secondary users’ voicemail invocations are directed to the Secondary Voicemail Pro instance.

  • All Expansion users’ voicemail invocations are directed to the Voicemail Pro instance defined by the System > Voicemail > Voicemail Destination setting. This is initially selected by the Initial Configuration Utility (ICU).

Administration

To ensure Voicemail Pro channel capacity is available for voicemail, call flow and announcement operations, the IP Office Server Edition Manager settings Voicemail Channel Reservation on the Primary and Secondary Server’s System > Voicemail tab can be configured to reserve channels exclusively for specific uses.

Mailbox capacity

The Voicemail Pro automatically creates a mailbox for each user and hunt group in the IP Office configuration. The individual capacity is fixed at 60 minutes per user or group mailbox.

If voicemail channel resources run out:

  • Unanswered calls continue to alert rather than going to voicemail.

  • Voicemail collect fails to connect to the voicemail.

  • Calls to attendants and call-flows will continue to alert. However, text-to-speech (TTS) will not be output during call flows.

  • Announcements are not played.

  • Note that the TTS channel capacity is 250.

  • Unless otherwise stated, R240 and R260 servers capacities are equivalent.

What happens if mailbox storage resources run out?

  • Voicemail leave operations will receive an announcement that the user/group’s mailbox is full.

  • Voicemail collect will continue to function.