Version 7.2 599 Mediant 1000B Gateway & E-SBC
User's Manual 27. Configuring Supplementary Services
a=rtpmap:0 pcmu/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20
a=sendrecv
Example B: The detection of a Wink signal generates the following SIP INFO
message:
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
27.11.3 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:
Figure 27-12: Enabling Emergency Call Handling
• For specific calls: Open the Tel Profiles table (see Configuring Tel Profiles on
page 459), and then for 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:
Figure 27-13: Emergency Numbers
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