Non-Traditional Communications to E9-1-1 PSAP Equipment
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document will identify, define, discuss and offer potential solutions
or alternatives to interfaces required to bring non-traditional sources
of information into Enhanced 9-1-1 Public Safety Answering Point (PSAP).
Traditional 9-1-1 signaling has been exclusively a calling party
initiated event, i.e.: dialing 9-1-1 from a telephone. In the context of
this document, signaling is intended to be related to the transmission
of both voice and data. The introduction of such signaling should be
conducted in such a manner that it does not interfere with the existing
functions of a 9-1-1 system. As used within the context of this document
non-traditional signaling is intended to be sources of incident
notification other than those explained above and within the body of
other NENA documents.
From the point of initiation non-traditional signaling takes two
basic (e.g. "active" and "passive") forms. Active signaling may best be
described as that which is initiated by a reporting party. Active
signaling may or may not include voice contact with the reporting party.
By definition active signaling requires the reporting party to perform
some action that advances the call for assistance to any networks
involved and to the call taking station of a PSAP.
- Passive signaling may best be described as that which is initiated in an automated fashion.
- Passive signaling may or may not include voice contact with the reporting party.
- When initiated, passive signaling advances the call for
assistance to any networks involved and to the call taking position of a
Another form of non-traditional signaling would be introduction of
voice notification from sources outside of the normal PSTN (Public
Switched Telephone Network). An example of this non-traditional
signaling would be the transmission of voice over a packet network (VoIP
over ATM, Frame Relay backbone or Voice over DSL (VoDSL)).
Some traditional PSTN resources are bypassed when using IP. Location
identification is the problem with this mode of operation. Under current
implementation, the 9-1-1 PSAP reached when dialing 9-1-1 is that of
the POP (Point Of Presence) into the PSTN for the IP voice carrier. This
poses a great problem for location identification.
Because of the unique and very specific needs of each of these
non-traditional sources of signaling, standards for interfaces are
required. Whether or not local government chooses to accept such
signaling, its introduction cannot interfere with the day-to-day
operations of a PSAP.