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Emergency Callback Feature Module
Understanding the Emergency Callback Feature
Emergency Callback Feature Module
Revised: July 29, 2008This document describes the Emergency Callback feature for Release 6.0 of the Cisco BTS 10200 Softswitch and explains how to use it.
Understanding the Emergency Callback Feature
The Emergency Callback (ECB) feature allows public safety answering point (PSAP) numbers to call back a subscriber provisioned on the Cisco BTS 10200 Softswitch. The BTS 10200 treats these callbacks as special high-priority calls so that for the subscriber with an active PSAP call, all terminating features are disabled except Call Waiting (CW) and Call Forwarding Busy (CFB). The advantage of the ECB feature is that the BTS 10200 blocks all terminating services that could potentially interrupt a call from a PSAP line.
ECB is an office-based feature. The BTS 10200 provides ECB to any subscriber associated with an office service that has ECB.
ECB is available when you assign it to the office service ID, then add the PSAP line directory number (DN) to the emergency_number_list table per the instructions for the Emergency Number List table in the Cisco BTS 10200 CLI Database. The BTS 10200 then determines which incoming calls should be classified as ECB. The BTS 10200 first checks the list of DNs specified in the emergency number list to determine if the calling DN is a PSAP number. If the DN is in the list, the BTS 10200 treats the call as ECB, blocking all terminating services except CW and CFB.
For additional information about the interaction between ECB and the CW and CFB features, refer to Feature Interactions.
Feature Interactions
This section describes the interactions between ECB and terminating features.
Call Waiting
A subscriber who is in an ECB call cannot invoke CW. The following table describes the interaction between ECB and CW.
Other Terminating Features
The following table describes the interaction between ECB and other features.
Anonymous Call Rejection
A PSAP call is always accepted by the ECB subscriber even if the caller is anonymous. If the calling party is unidentifiable to the BTS 10200, the call is not classified as ECB. If ACR is activated, the call is rejected.
Automatic Recall
The ECB subscriber cannot invoke the automatic recall feature for a PSAP line.
Busy Line Verification
If the ECB subscriber is already engaged in an ECB call, the subscriber does not receive an interrupt and the PST is played back.
CALEA
Communications Assistance for Law Enforcement Act (CALEA) is supported for ECB exactly as it is with normal calls.
Call Forwarding Busy
If the ECB subscriber is in a call, the PSAP caller hears a busy tone but the call is not forwarded.
Call Forwarding No Answer
If the subscriber does not pick up the call, it is not forwarded to the forwarding DN. The CFNA timer is not started and the phone continues to ring.
Call Forwarding Unconditional
The subscriber receives the PSAP call even if CFU is activated.
Call Hold/Call Park/Call Transfer/Three Way
These services are inhibited during a PSAP call.
Calling Number Delivery/Calling Name Delivery
The PSAP calling name and number are not displayed to the subscriber.
Call Waiting
Refer to Call Waiting for a description of ECB interaction with CW.
Do Not Disturb
The subscriber receives PSAP calls even if DND is activated.
Directed Call Pickup
No other subscribers can pick up PSAP calls.
Distinctive Ringing
Distinctive ringing is not available.
Multi-Line Hunt Group
There is no special handling for MLHG. MLHG behaves the same for ECB and non-ECB calls.
Seasonal Suspend
A subscriber who has the seasonal suspend feature enabled can receive calls.
Selective Call Acceptance
The PSAP call is not checked against the SCA list, so the call is not blocked.
Selective Call Rejection
The PSAP call is not checked against the SCR list, so the call is not blocked.
Temporary Disconnect
Temporary disconnect subscribers do not receive ECB calls.
Provisioning
Use the following procedure to provision the Emergency Callback feature.
Step 1
Add ECB to the feature table.
add feature fname=ECB; tdp1=TERMINATION_ATTEMPT_AUTHORIZED; tid1=ECB_TRIGGER; ttype1=R; description=Emergency Callback; feature_server_id=FSPTC235;Step 2
add service id=499;fname9=ECBStep 3
add emergency_number_list digit_string=2145551212
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