AudioCodes E-SBC User Manual page 324

CHAPTER 16 Services
ELIN
4257275616
The ELIN table stores this information for a user-defined period (see
Callback
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 100.
4. The device uses the ELIN number as the E9-1-1 calling number and sends it in the SIP INVITE
or ISDN Setup message (as an ANI / Calling Party Number) to the SIP Trunk or PSTN.
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
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>
Time
22:11:45
Timeout), starting from when the E9-1-1 call, established with the PSAP, terminates.
Mediant 1000 Gateway & E-SBC | User's Manual
Count Index
0 1
- 286 -
Call From
4258359777
Configuring the E9-1-1