AudioCodes Mediant 600 User Manual page 376

as discussed later in 'PSAP Callback to Lync 2010 Clients for Dropped E9-1-1 Calls'
on page 378. The ELIN table also stores the following information:
•
ELIN: ELIN number
•
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
4257275678
4257275999
4257275615
4257275616
The ELIN table stores this information for a user-defined period (see 'Configuring the
E9-1-1 Callback Timeout' on page 379), 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
User's Manual
Time Count
22:11:52 0
22:11:57 0
22:12:03 0
22:11:45 0
376
Mediant 600 & Mediant 1000
Index Call From
2 4258359333
3 4258359444
0 4258359555
1 4258359777
Document #: LTRT-83313