NEC Electra Elite IPK II Features And Specifications Manual page 538

Document Revision 1
Enhanced 911 Service with ISDN PRI
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Enhanced 911 Service is supported by defining an available ISDN PRI trunk as a E911 trunk.
When a station user dials 911, 9+ 911, or CO line key + 911, the E911 trunk is selected and the
Public Safety Answering Point (PSAP) is called. The PSAP is provided callback information
generated from the Electra Elite IPK system.
Two B-Channel Transfers (ISDN – PRI only)
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Depending on your ISDN –PRI configuration from Telco, the system may have the ability for a
Multiline Terminals or Single Line Telephone to use the optional "Two B-Channel Transfer for PRI"
this service is provided by some National ISDN carriers in the U.S. (comparable to an Analog
Centrex). This service supports trunk-to-trunk transfer on the Telco side. With this option enabled,
two trunk calls on the Electra Elite IPK II system can be connected together by the Telco, releasing
the trunks from the Electra Elite IPK II and connecting the outside parties together.
To use the ISDN Two B-Channel Transfer, the system sends a Facility Message to the currently
active PRI trunk and then sets the retry timer (Program 24-02-09). The system will resend the
Facility timer based on the retry timer. If there is no response after the 3rd resend, the system
considers the transfer as failed and stops resending. When the transfer has succeeded, the Telco
sends the information to the system in the Facility, Disconnect or Release Message. When the
system receives a Facility Message, it sends back Disconnect or Release then releases the trunks.
When the system receives a Disconnect or Release, the system simply releases the trunks (the
other trunk will also receive a Disconnect or Release). If the transfer fails, the Telco sends the
system Facility message with the fail information (some Telco's may send an Alerting, Disconnect
or Release Message). In this case, the trunks are not transferred and remain in the system.
SMDR Includes Dialed Number
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The SMDR report can optionally print the trunk's name (entered in system programming) or the
number the incoming caller dialed (i.e., the dialed ISDN digits). This gives you the option of
analyzing the SMDR report based on the number your callers dial. (This option also applies to a
DID trunk as well.)
Display Shows Why Caller ID is Not Available
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With Caller ID enabled, the system will provide information for ISDN calls that do not contain the
Caller ID information. If the Caller ID information is restricted, the telephone display will show
"PRIVATE". If the system is not able to provide Caller ID information because the Telco information
is not available, then the display will show "OUT OF AREA".
Conditions
Primary Rate Interface (PRI):
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The system is compatible with ISDN Primary Rate Interface (PRI) services. PRI services
currently supported include:
Basic PRI Call Control (BCC)
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Display of incoming caller's name and number when allowed by Telco
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Routing in the system based on the number the caller dialed
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Electra Elite IPK II
ISDN Compatibility