Version 6.6 345 Mediant 2000
User's Manual 26. Configuring Supplementary Services
• Time: Time at which the original E9-1-1 call was terminated with the PSAP
• Count: Number of E9-1-1 calls currently using this ELIN
An example of the ELIN database table is shown below:
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' on page 348), 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 depend on the AudioCodes ELIN Gateway
deployed in the Lync Server 2010 environment:
• Mediant 1000 Series and Mediant 2000: 100 entries
• Mediant 3000: 300 entries
4. The ELIN Gateway uses the ELIN number as the E9-1-1 calling number and sends it
in the ISDN Setup message (as an ANI / Calling Party Number) to the 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;t
ag=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:R4bCDaUj51a06PUbk
raS0QAA;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
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