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Emergency Services and eServices Events
The emergency services numbers follow the same rules as those defined for the pattern matching strings
in
Dialing Parameters on page 36.
The VoIP Subsystem allows flexible treatment of emergency numbers. They can be sent either via the
Internet or over the PSTN. When you are connected to a SUBSCRIPTION server that supports the
Eservices (Emergency Services) event, the server and VoIP Subsystem can coordinate with each other to
make sure that the VoIP Subsystem will route emergency calls via the appropriate connection. Make sure
to include all emergency numbers in both the default VoIP and PSTN parameters, if you want the VoIP
Subsystem to make a flexible selection.
Parameter Description Default
Emergency Numbers Routed via VoIP
Specifies which emergency numbers to
route over VoIP
100, 11x, 911, 999
Emergency Numbers Routed via the
PSTN
Specifies which emergency numbers to
route over PSTN
100, 11x, 911, 999
Default Emergency Numbers Routed
via VoIP
Specifies which default emergency
numbers to route over VoIP
100|11x|911|999
Default Emergency Numbers Routed
via the PSTN
Specifies which default emergency
numbers to route over PSTN
100|11x|911|999
Always Route Emergency Numbers
via the PSTN
When enabled, this parameter configures
the VoIP Subsystem to always send
emergency numbers to the PSTN. If the
PSTN line is unavailable, then emergency
calls are routed via VoIP.
Disabled
Emergency Numbers via the PSTN Alt
(Click Help)
When enabled, this parameter allows the
VoIP Subsystem to determine which port
to send emergency numbers to, based on
negotiation over the event Eservices with
the subscription server. If the subscription
to the Eservices event fails, then
emergency numbers are routed to the
PSTN.
If both Always Route Emergency Numbers via
PSTN and Emergency Numbers via the PSTN
Alt are both disabled, then emergency
calls will be routed according to
negotiation through the event Eservices. If
the subscription fails, then emergency
calls are preferentially routed via VoIP.
Enabled
Note: If neither the PSTN nor VoIP is available, users will hear no dial tone when they pick up the
handset. In that case, they should understand that they cannot make an emergency call.
Chapter 8: Subscription Services 43