Pre-Empting Existing Calls For E911 Ip-To-Tel Calls - AudioCodes Mediant 800 User Manual

CHAPTER 28 Configuring Supplementary Services
INFO sip:4505656002@192.168.13.40:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.13.2:5060
From: port1vega1 <sip:06@192.168.13.2:5060>
To: <sip:4505656002@192.168.13.40:5060>;tag=132878796-1040067870294
Call-ID: 0010-0016-D69A7DA8-1@192.168.13.2
CSeq:2 INFO
Content-Type: application/broadsoft
Content-Length: 17
event flashhook

Pre-empting Existing Calls for E911 IP-to-Tel Calls

If the device receives an emergency call (E911) from the IP network destined to the Tel and there
are unavailable channels (e.g., all busy), the device terminates one of the current calls (arbitrary)
and then sends the emergency call to that channel. The preemption is done only on a channel
belonging to the same Trunk Group for which the emergency call was initially destined and if the
'Channel Select Mode' parameter (ChannelSelectMode) is configured with a value other than By
Dest Phone Number (0). Call preemption is done only if the incoming IP-to-Tel call is identified as
an emergency call.
➢
To configure call preemption for emergency calls:
1. Enable call preemption for emergency calls:
● For all calls: Open the Priority & Emergency page (Setup menu > Signaling & Media
tab > SIP Definitions folder > Priority and Emergency), and then from the 'Call Priority
Mode' drop-down list (CallPriorityMode), select Emergency:
● For specific calls: Open the Tel Profiles table (see
the required Tel Profile, configure the 'Call Priority Mode' drop-down list (TelProfile_
CallPriorityMode) to Emergency.
2. (Optional) Configure emergency telephone numbers (e.g., 911). Open the Priority & Emergency
page (Setup menu > Signaling & Media tab > SIP Definitions folder > Priority and
Emergency), and then in the 'Emergency Number' fields (EmergencyNumbers), configure the
emergency numbers:
The device identifies the IP-to-Tel call as an emergency call if the destination number matches
one of these configured emergency numbers. For E911, you must configure the parameter to
"911".
Mediant 800 Gateway & E-SBC | User's Manual
Configuring Tel
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Profiles), and then for