Dialing Plan Configuration; Characteristics Of E911 Calls - Nortel 1120E Administration Manual

100 Emergency 911 - Operator control of disconnect
Dialing plan configuration
To allow operator control of disconnect during a 911 call, the IP Phone
1120E must identify a 911 call as soon as a 911 call is initiated. The IP
Phone 1120E uses an emergency flag in the dialing plan to identify a 911
call. When the dialing plan detects that an emergency number is dialed, it
automatically switches to operator controlled disconnect mode when the call
is answered. The dialing plan can have multiple emergency numbers.

Characteristics of E911 calls

During an E911 call, the user:
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During an E911 call the keys function as follows:
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Copyright © 2008, Nortel Networks
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Examples of an emergency flag in the dialing plan
(911)|(911)# &&sip:$$@$n;user=phone&&emergency
(4357)|(4357)# &sip:$$@$n;user=phone&&emergency
cannot make outgoing calls
is not notified of incoming calls and cannot accept incoming calls.
Incoming calls receive a busy signal
cannot transfer, join, or conference the E911 call, place the E911 call on
hold, or park the E911 call
cannot receive an incoming call
cannot auto-retrieve a parked call and auto-retrieval of parked calls is
not displayed
cannot disconnect the E911 call. Only an E911 center or operator can
disconnect the emergency call
cannot change Audio Quality
can reply to IM popups, which are operational during an E911 call
the Services, Inbox, Outbox, and Address-Book keys are all disabled
a right click of the mouse does not show the services menu
the conspicuous keys are disabled
the mute key and hold key are disabled
the increase and decrease volume keys remain functional.
the feature keys are visible and all except the speed-dial keys are
functional.
SIP Firmware Release 1.1 for IP Phone 1120E Administration
NN43112-300 02.03 Standard
27 May 2008