CHAPTER16 Services
Mediant 800 Gateway & E-SBC | User's Manual
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Pre-empting Existing Calls for E9-1-1 Calls
If the ELIN device receives an E9-1-1 call from the IP network and there are unavailable channels
(for example, all busy), the device immediately terminates one of the non-E9-1-1 calls (arbitrary)
and accepts the E9-1-1 call on the freed channel:
■ SBC application: The preemption is done only on a call pertaining to the same source IP Group
from which the E9-1-1 call is received, or the same destination IP Group (i.e., PSAP Server).
■ Gateway application: The preemption is done only on a channel pertaining to the same Trunk
Group for which the E9-1-1 call was initially destined. For example, if an E9-1-1 call is destined
for Trunk Group #2 and all the channels belonging to this group are busy, the device terminates
one of the calls in this group to free a channel for accepting the E9-1-1 call.
This feature is initiated only if the received SIP INVITE message contains a Priority header set to
"emergency", as shown below:
PRIORITY: emergency
PSAP Callback to Skype for Business Clients for Dropped E9-1-1 Calls
As the E9-1-1 service automatically provides all the contact information of the E9-1-1 caller to the
PSAP, the PSAP operator can call back the E9-1-1 caller. This is especially useful in cases where
the caller disconnects prematurely. However, as the Enterprise sends ELINs to the PSAP for E9-1-
1 calls, a callback can only reach the original E9-1-1 caller using the device to translate the ELIN
number back into the E9-1-1 caller's extension number.
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