User's Manual
276
Document #: LTRT-10375
Mediant 500 MSBR
18.7.3.1 Detecting and Handling E9-1-1 Calls
The ELIN device identifies E9-1-1 calls and translates their incoming E9-1-1 calling
numbers into ELIN numbers, sent toward the PSAP. The device handles the received E9-
1-1 calls as follows:
1.
The device identifies E9-1-1 calls if the incoming SIP INVITE message contains a
PIDF-LO XML message body. This is indicated in the SIP
Content-Type
header, as
shown below:
Content-Type: application/pidf+xml
2.
The device extracts the ELIN number(s) from the "NAM" field in the XML message.
The "NAM" field corresponds to the <CompanyName> column in the Location
Information Server (LIS). The device supports up to five ELIN numbers per XML
message. The ELINs are separated by a semicolon. The digits of the ELIN number
can be separated by hyphens (xxx-xxx-xxx) or they can be adjacent (xxxxxxxxx), as
shown below:
<ca:NAM>1111-222-333; 1234567890 </ca:NAM>
3.
The device saves the
From
header value of the SIP INVITE message in its ELIN
database table (
Call From
column). The ELIN table is used for PSAP callback, as
discussed later in PSAP Callback to Skype for Business Clients for Dropped E9-1-1
Calls on page 278. 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 the 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
Summary of Contents for Mediant 500 MSBR
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Page 837: ...Part X Status Performance Monitoring and Reporting ...
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