User's Manual 314 Document #: LTRT-10632
Mediant 800B Gateway & E-SBC
v=0
o=- 0 0 IN IP4 Client
s=session
c=IN IP4 Client
t=0 0
m=audio 30684 RTP/AVP 114 111 112 115 116 4 3 8 0 106 97
c=IN IP4 172.29.105.23
a=rtcp:60423
a=label:Audio
a=rtpmap:3 GSM/8000/1
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=ptime:20
------=_NextPart_000_4A6D_01CAB3D6.7519F890
Content-Type: application/pidf+xml
Content-ID: <voip_911_user1@contoso.com>
<?xml version="1.0" encoding="utf-8"?>
<presence xmlns="urn:ietf:params:xml:ns:pidf"
xmlns:gp="urn:ietf:params:xml:ns:pidf:geopriv10"
xmlns:bp="urn:ietf:params:xml:ns:pidf:geopriv10:basicPolicy"
xmlns:ca="urn:ietf:params:xml:ns:pidf:geopriv10:civicAddr"
xmlns:ms="urn:schema:Rtc.LIS.msftE911PidfExtn.2008"
entity="sip:voip_911_user1@contoso.com"><tuple
id="0"><status><gp:geopriv><gp:location-
info><ca:civicAddress><ca:country>US</ca:country><ca:A1>WA</ca:A1><ca:
A3>Redmond</ca:A3><ca:RD>163rd</ca:RD><ca:STS>Ave</ca:STS><ca:POD>NE</
ca:POD><ca:HNO>3910</ca:HNO><ca:LOC>40/4451</ca:LOC>
<ca:NAM>1111-222-333; 1234567890 </ca:NAM>
<ca:PC>98052</ca:PC></ca:civicAddress></gp:location-info><gp:usage-
rules><bp:retransmission-allowed>true</bp:retransmission-
allowed></gp:usage-
rules></gp:geopriv><ms:msftE911PidfExtn><ms:ConferenceUri>sip:+1425555
0199@contoso.com;user=phone</ms:ConferenceUri><ms:ConferenceMode>twowa
y</ms:ConferenceMode><LocationPolicyTagID
xmlns="urn:schema:Rtc.Lis.LocationPolicyTagID.2008">user-
tagid</LocationPolicyTagID
></ms:msftE911PidfExtn></status><timestamp>1991-09-
22T13:37:31.03</timestamp></tuple></presence>
------=_NextPart_000_4A6D_01CAB3D6.7519F890--
15.8.3.2 Pre-empting Existing Calls for E9-1-1 Calls
If the ELIN device receives an E9-1-1 call from the IP network and there are unavailable channels
(for example, all busy), the device immediately terminates one of the non-E9-1-1 calls (arbitrary)
and accepts the E9-1-1 call on the freed channel:
SBC: The preemption is done only on a call pertaining to the same source IP Group from
which the E9-1-1 call is received, or the same destination IP Group (i.e., PSAP Server).
Gateway: The preemption is done only on a channel pertaining to the same Trunk Group for
which the E9-1-1 call was initially destined. For example, if an E9-1-1 call is destined for
Trunk Group #2 and all the channels belonging to this group are busy, the device terminates
one of the calls in this group to free a channel for accepting the E9-1-1 call.
This feature is initiated only if the received SIP INVITE message contains a Priority header set to
"emergency", as shown below:
PRIORITY: emergency
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