The Call Forwarding - Voice Mail (CFVM) feature provides the capability to redirect calls intended for the subscriber to the voice mail system, if the called station is in use or if the call remains unanswered for a preset number of rings. Furthermore - and more important - it ensures that MWI (Message Waiting Indication) is delivered to the SIP endpoint when a new voice mail message is present.
CFVM can be used independently, or it can be used in conjunction with other call forwarding features:
If it is used independently, all unanswered or busy calls are forwarded to voice mail, and the user receives MWI.
If it is used in conjunction with other call forwarding features, different targets can be assigned to different scenarios, and the user receives MWI for the calls that were routed to voice mail. This capability is useful, for example, if a user wants unanswered calls to route to an assistant, and busy-forwarded calls to route to voice mail.
The administrator can also specify the conditions under which a MWI indication from the voice-mail system is considered valid. Based on the subscription state and status of the subscriber's CFVM feature:
If CFVM is not subscribed, the user does not receive MWI
If CFVM is subscribed but inactive, the acceptance of an MWI indication for a voice mail subscriber is based on the setting of the RTP (Resilient Telco Platform) parameter Srx/Main/MwiOnVMInactive:
When set to True, an MWI indication is accepted and processed.
When set to False, an MWI indication is ignored.
If CFVM is subscribed and active, a MWI is accepted and processed.
CFVM in Combination with CFSIE
CFVM and CFSIE (Call Forwarding System Internal/External) features can be assigned to the same subscriber. However, none of the CFSIE features can be activated if CFVM is active; the reverse is also true. For this reason, in order to get MWI with active CFSIE, the RTP parameter Srx/Main/MwiOnVMInactive has to set to be True. This is the default value.
CFVM in Combination with CFB and/or CFDA
The administrator sets the RTP parameter Srx/Main/CFVMCompatibility to specify if it is allowed to combine CFVM with any of the station-controlled call forwarding features CFB (Call Forwarding - Busy) or CFDA (Call Forwarding - Don't Answer).
If set to False, CFVM can not be combined with CFB or CFDA. This is the default.
If set to True, these combinations are allowed, i.e. CFVM and CFB and/or CFDA can be assigned to the same subscriber. Note that if CFVM and CFB/CFDA are active, the latter take precedence in a busy line/no answer situation.
Message Waiting IndicationParent topic: Lotus Sametime Unified Telephony-based Call Forwarding Features
Call Forwarding - Unconditional (Station-controllable)
Call Forwarding on Busy (Station-controllable)
Call Forwarding on No Reply (Station-controllable)
Selective Call Forwarding (Station-controllable)
Enhanced Call Forwarding
Call Forwarding System-Internal/External (CFSIE)
The MWI (Message Waiting Indication) feature permits the reception of a subscriber's MWI status from a voice mail system via SIP. In a multiple-platform environment (for example, when a is present), Lotus Sametime Unified Telephony sends and receives MWI over SIP-Q.
How to Provision a Subscriber for Call Forwarding - Voice Mail
This procedure describes how to configure CFVM (Call Forwarding - Voice Mail) at the feature profile or subscriber level. Feature profiles, in turn, can be created and configured at the switch level or the BG (Business Group) level. At the subscriber level, the previously assigned feature profile can be overwritten to selectively enable, disable or modify the feature configuration for the particular subscriber. Those subscriber-level modifications effectively disconnect the individual service configuration from the underlying feature profile: a subsequent Reset Subscriber Lines
on the feature profile will not influence a disconnected subscriber's service configuration.
Call Forwarding Restrictions
RTP System Parameters for Call Forwarding
RTP Management via Telephony Control Server Assistant