The Call Transfer feature permits a subscriber to manually redirect an established call to another party as and when required. The transfer may be performed with or without consulting the transfer-to party.
Call Transfer is implemented as an interaction between the SIP endpoint and Lotus Sametime Unified Telephony: the different types of transfer requests are generated by the telephone (on behalf of the user) and the processing and checking (e.g. for transfer restrictions) is performed by Lotus Sametime Unified Telephony.
The Call Transfer Security feature ensures that unsuccessfully transferred calls are recalled to the transferring party.
The following transfer types are supported:
Transfer with third-party consultation:
This type permits a screened transfer. After speaking with the transfer-to party, the subscriber can transfer the first party to the transfer destination.
This type permits the subscriber to perform a call transfer prior to the transferred-to destination answering the call. The transfer request is completed during ringing or call waiting (camp-on).
The subscriber has some control over the attempted transfer:
Upon the subscriber hearing ringback tone and seeing a display, the subscriber can complete the transfer before the destination answers.
The subscriber can also wait until the destination answers before completing the transfer.
This type permits a transfer without consultation to another party. With blind transfer the subscriber does not control the call during the transfer.
A blind transfer where the transferred and transferred-to parties are the same is blocked.
The subscriber is allowed to perform the transfer provided that he or she is allowed to call the transfer-to party and that no additional transfer restrictions apply. The following restrictions can be provisioned per subscriber:
No restrictions, i.e. all calls (internal/external) can be transferred to all destinations.
The subscriber is not allowed to transfer the call if both the transferred and transferred-to parties are external. All other calls can be transferred.
Transfer is allowed for internal calls only, and to internal destinations only.
Restricted Trunk Transfer
Starting with Lotus Sametime Unified Telephony 18.104.22.168, there is a new option to disallow call transfers that would result in bypassing existing Toll and Call Restrictions: if a Lotus Sametime Unified Telephony subscriber has Toll and Call Restrictions that would prevent him from calling a certain PSTN Number, then another Lotus Sametime Unified Telephony subscriber can be disallowed to use call transfer to establish a connection between the two.
There is a complementary configuration option to force the release of large conferences when, in case of two parties remaining in conference, one party is restricted to call the second party.
"Restricted Trunk Transfer" can be activated and deactivated through subscriber provisioning.
Call Detail Records
For complex call scenarios, for example, when a call is transferred with consultation, a thread identifier correlates the CDRs associated with each leg of the call.
Call Transfer Security (with Intercept)Parent topic: Calling Services
The Call Transfer Security feature provides the capability to ensure that a subscriber does perform an unscreened or blind transfer to an invalid destination and that the transferred party is not left ringing for too long at another internal subscriber's endpoint. The transferring party is recalled and/or the call is redirected to its transfer intercept destination.
How to Provision a Subscriber for Call Transfer
This procedure describes how to configure Call Transfer 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.
During Call Transfer, if all parties are located in the same Lotus Sametime Unified Telephony system, extended information about the involved parties is presented on the related phones' displays. This information depends on the type of transfer being performed.
Toll and Call Restrictions
Park to Server
How to Provision a Subscriber for Park to Server
How to Provision a Subscriber for ONS