AudioCodes Mediant 4000 SBC, User Manual

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CHAPTER 16 Services
Mediant 4000 SBC | User's Manual
ELIN Time Count Index Call From
4257275678 22:11:52 0 2 4258359333
4257275999 22:11:57 0 3 4258359444
4257275615 22:12:03 0 0 4258359555
4257275616 22:11:45 0 1 4258359777
The ELIN table stores this information for a user-defined period (see Configuring the E9-1-1
Callback Timeout ), starting from when the E9-1-1 call, established with the PSAP, terminates.
After this time expires, the table entry with its ELIN is disregarded and no longer used (for
PSAP callback). Therefore, table entries of only the most recently terminated E9-1-1 callers are
considered in the ELIN table. The maximum entries in the ELIN table is 300.
4. The device uses the ELIN number as the E9-1-1 calling number and sends it in the SIP INVITE
(as an ANI / Calling Party Number) to the SIP Trunk.
An example of a SIP INVITE message received from an E9-1-1 caller is shown below. The SIP
Content-Type header indicating the PIDF-LO, and the NAM field listing the ELINs are shown in
bold typeface.
INVITE sip:911;phone-context=Redmond@192.168.1.12;user=phone SIP/2.0
From: "voip_911_user1"<sip:voip_911_
user1@contoso.com>;epid=1D19090AED;tag=d04d65d924
To: <sip:911;phone-context=Redmond@192.168.1.12;user=phone>
CSeq: 8 INVITE
Call-ID: e6828be1-1cdd-4fb0-bdda-cda7faf46df4
VIA: SIP/2.0/TLS 192.168.0.244:57918;branch=z9hG4bK528b7ad7
CONTACT: <sip:voip_911_
user1@contoso.com;opaque=user:epid:R4bCDaUj51a06PUbkraS0QAA;gruu>;text;audio;
video;image
PRIORITY: emergency
CONTENT-TYPE: multipart/mixed; boundary= ------=_NextPart_000_4A6D_
01CAB3D6.7519F890
geolocation: <cid:voip_911_user1@contoso.com>;inserted-by="sip:voip_911_
user1@contoso .com"
Message-Body:
------=_NextPart_000_4A6D_01CAB3D6.7519F890
Content-Type: application/sdp ; charset=utf-8
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
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