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Cisco BTS 10200 Softswitch SIP Protocol User Guide
OL-5352-03
Chapter 2 SIP Protocol Subscriber Features
Jointly-Provided Features
Do Not Disturb
Activate/Deactivate Feature
SIP Software Clients
The user interface for applicable software clients is similar to a SIP handset.
Call Transfer (Blind and Attended)
The SIP call transfer (CT) feature is supported for SIP subscribers on Cisco BTS 10200 Release 4.4. Call
transfer in Cisco BTS 10200 requires provisioning the “REFER” feature as an office trigger. See the
Cisco BTS 10200 SIP Protocol Provisioning Guide for details.
The call transfer feature requires phone support for sending the SIP REFER message. See the phone
documentation for details on the user interface and procedures to effect a call transfer. Both blind and
attended transfers are supported.
The following caveats apply when using call transfers:
1. Attended transfer to a transfer-target is supported only after the target answers; that is, consultative
attended transfer is supported. Attended transfer is not possible, while the transfer-target is being
alerted (ringing state).
2. Only calls on Cisco BTS 10200 may be replaced by an attended transfer. If a SIP subscriber has
independently placed a call to another SIP subscriber, without using Cisco BTS 10200, then
Cisco BTS 10200 cannot replace the call made outside of Cisco BTS 10200.
Distinctive Ringing
Distinctive ringing uses a special ringing pattern to alert the called user of incoming calls from
pre-selected telephone numbers. This is a CLASS feature and is offered to both Business and Residential
users.
You can edit the list of selected numbers though the Screening List Editing (SLE) feature, which requires
configuring an IVR with the Cisco BTS 10200 Softswitch. Distinctive ringing can be assigned to a
station and to the group, and applied to users based on the call type/calling number. When assigned to a
group, distinctive ringing is applied to users in the group based on the call type. When assigned to the
line, distinctive ringing is applied to the user based on the calling number. The Cisco BTS 10200 sends
an Alert-Info header in the outgoing INVITE message, instructing the SIP phone to play a specific ring
tone.
Distinctive ringing depends on the SIP phone’s capability to support processing of the information
received in Alert-Info header.
Distinctive Ringing for Centrex DID Calls
The Cisco BTS 10200 Softswitch sends an Alert-Info header in the outgoing INVITE message,
instructing the SIP phone to play a specific ring tone. Distinctive ringing depends on the SIP phone’s
capability to support processing the information received in Alert-Info header.