Lotus Sametime Unified Telephony-based call forwarding features provide a means to customize the handling of calls when a subscriber is unavailable to answer them.
All Lotus Sametime Unified Telephony-based call forwarding features can be provisioned at the feature profile level with possible modifications at the subscriber level.
Lotus Sametime Unified Telephony vs. Endpoint-Based Call Forwarding
Lotus SIP endpoints also provide the capability to configure and control local call forwarding. However, it is strongly recommended that the endpoint-based call forwarding features are not used simultaneously with call forwarding features that reside in Lotus Sametime Unified Telephony.
The following are the recommendations for usage of this feature:
OpenStage endpoints should use Lotus Sametime Unified Telephony-based station call forwarding because it provides a more consistent call flow with better feature interaction checks.
All other endpoints should use endpoint-based call forwarding.
Station-Controllable Call Forwarding
For some call forwarding features, the subscriber may be allowed to control the call forwarding behavior to a certain extent. For instance, he may be allowed to
activate and deactivate the feature
specify the forwarding destination
Station control is possible via feature access codes or OpenStage CSTA (Computer Supported Telecommunications Applications) over SIP.
The following are the forwarding target requirements:
The number must be a routable destination in the private network or in the PSTN - for example, it cannot be a feature access code.
The number must be compatible with any toll and call restrictions in effect for the called subscriber.
Note that the called DN's dialing characteristics, rather than the caller's, are used when forwarding the call.
When a call is forwarded, CDRs (Call Detail Records) are generated as follows:
One standard CDR for the call leg that takes place between the original calling party and the final forwarded-to (connected) party. This CDR type is generated for all calls.
One call forwarding CDR for each call leg created when the original call is forwarded.
Because Lotus Sametime Unified Telephony permits up to five forwards per call, up to five of these CDRs can be generated. For example, assume that party A calls party B. Party B forwards to party C; party C then forwards to party D. In this scenario:
A standard CDR is generated for the A-to-D call.
Individual call forwarding CDRs are generated for the B-to-C and C-to-D call legs.
Intermediate CDRs provide backup information to allow partial charging for long duration calls (calls lasting longer than 30 minutes) if a standard CDR is not generated due to some type of failure. As soon as a standard CDR is available for a call, any intermediate CDRs are no longer needed, so they are automatically discarded.
Parent topic: Mobility and Collaboration
Call Forwarding - Unconditional (Station-controllable)
The station-controllable Call Forwarding - Unconditional (CFU) feature, sometimes known as Call Forwarding - All Calls, provides the capability to redirect all calls intended for the subscriber to another destination. This feature can be controlled from the station.
Call Forwarding - Remote Activation
The Call Forwarding - Remote Activation feature, sometimes known as RACF (Remote Activation Call Forwarding), is an optional capability of the Call Forwarding - Unconditional feature. It allows subscribers to control Call Forwarding - Unconditional from any location.
Call Forwarding on Busy (Station-controllable)
The station-controllable Call Forwarding on Busy (CFB) feature, sometimes known as Call Forwarding - Busy Line (CFBL), provides the capability to redirect calls intended for the subscriber to another destination when the subscriber's station is in use.
Call Forwarding on No Reply (Station-controllable)
The station-controllable Call Forwarding on No Reply feature, sometimes known as Call Forwarding - Don't Answer (CFDA), provides the capability to redirect calls intended for the subscriber to another destination if the call is not answered after a preset number of rings.
Selective Call Forwarding (Station-controllable)
The station-controllable Selective Call Forwarding (SCF) feature allows to selectively forward calls based on the caller's identity. This is achieved by preparing a list of numbers (screening list) that may either serve as White List
or Black List
Call Forwarding - Unreachable
The Call Forwarding - Unreachable feature, also known as Call Forwarding - Dependable, provides the capability to forward calls for the subscriber's line to another line when the destination is unreachable due to being either unregistered, not responding (unplugged) or audit blocked. Different forwarding targets can be specified for internal calls (from within the business group) and external calls (from outside the business group).
Enhanced Call Forwarding
The Enhanced Call Forwarding (ECF) feature, sometimes known as Call Forwarding - Time-of-Day (CF-ToD), provides sophisticated call forwarding based on a configurable schedule, on the forwarding condition (unconditional, busy, no answer) and on the caller identity.
Call Forwarding - Voice Mail
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.
Call Forwarding System-Internal/External (CFSIE)
The Call Forwarding System-Internal/External (CFSIE) features provide administrators the capability to redirect calls intended for the subscriber's line to another line. Different forwarding targets can be specified for internal calls (from within the business group) and external calls (from outside the business group).
Call Forwarding - Return
Call Forwarding - Return allows the forwarded-to station to call the forwarding station and override (ignore) the forwarding.
Remote Call Forwarding
The Remote Call Forwarding (RCF) feature provides the capability to redirect calls placed to a particular access number (the RCF DN) to a fixed destination.
Call Forwarding Restrictions
With the Call Forwarding Restrictions feature, certain traffic types can be excluded from being used during Call Forwarding execution. System-wide and subscriber specific restrictions can be enforced and apply to both Lotus Sametime Unified Telephony-based and endpoint-based call forwardings.
OpenStage Feature Access
OpenStage endpoints can be configured such that their call forwarding and DND (Do Not Disturb) keys control the Lotus Sametime Unified Telephony-based Call Forwarding - Unconditional, Call Forwarding - Busy, Call Forwarding - Don't Answer and DND state rather than their endpoint-based counterparts.
Feature Access Codes for Call Forwarding
Feature access codes enable subscribers to activate or deactivate station-controllable CF (Call Forwarding) services and set CF-related properties from their endpoints. A feature access code can either be dialed or it can be assigned to a function key on the subscribers' phones, providing seamless access to server-side features.
RTP System Parameters for Call Forwarding
Certain aspects of CF (Call Forwarding) services are controlled on a systemwide basis by RTP (Resilient Telco Platform) system parameters. Any changes made to these parameters affect all business groups and their members. Typically, these parameters are set during initial system configuration, to enforce global system policies and ensure proper feature interworking.
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