LBI-39001
10
Task
Accomplishing Task with Jessica
The radio ID is always a 5-digit
number. For an individual call, the
PSTN user enters a 5-digit radio LID.
For a group call, the 4-digit GID must
be preceded by a "2," thus forming a 5-
digit number.
5. If the PSTN user wishes to place a
digital voice call, a "3" precedes the 5-
digit radio ID.
Receiving a radio-
originated call
The PSTN user receives a radio-originated
call as a normal telephone call.
Terminating a call
A radio-originated or PSTN-originated
call is terminated when the PSTN user
hangs up the phone.
A radio user may also terminate the call
by pressing the SPC or Clear key, or by
allowing the hang time to expire.
Depending on the phone system, EDACS
may drop a call after a delay. If PSTN
does not provide line clearing, then the
call is not terminated when the phone
hangs up. The radio user must terminate
the call.
LBI-39001
3
1. SCOPE
This manual explains how to use the Enhanced Digital Access
Communications System (EDACS) Jessica Telephone Interconnect
System. The Jessica system allows telephones on the Public Switched
Telephone Network (PSTN) to reach radio users. Conversely, the
system allows radio users to make telephone calls. This manual
provides a brief explanation of how to access Jessica services, followed
by a more detailed discussion for advanced users.
Several terms used throughout this manual may be unfamiliar to the
user. These terms are explained in this section and in the Glossary to
help avoid confusion. Private Branch Exchange (PBX) is a telephone
switch commonly used in business applications. For example, dialing
the last four digits of a telephone number to call someone else in your
office makes use of a PBX to reach that person. Public Switched
Telephone Network (PSTN) is a telephone switch for public use, as
opposed to private use. For example, dialing your home telephone
number from your office uses a PSTN to reach the home number. An
inbound call is a phone-originated call to a radio and an outbound call is
a radio-originated call to a phone. Hang time is a specified time (hang
time default is 30 seconds at the PBX Interface) during which the Push-
to-Talk (PTT) button on a radio must be pressed to continue the call. If
the PTT button is not pushed within the hang time limit, then EDACS
disconnects the call. Conversation time limit is the maximum amount
of time (default is 5 minutes at the PBX Interface) allowed for all
interconnect calls. If a call exceeds the conversation limit, then EDACS
drops the call.
NOTE
Access to EDACS Systems features depends on how the EDACS System
Administrator has configured the system. Check with your EDACS
System Administrator for information on proper usage before accessing
the system.
