L-3 Communications CEU, User Manual

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STE User’s Manual Calls
Rel. 2.6 7-23
Figure 7-34. TRI-TAC Incoming Call Menu
You may answer an incoming call by lifting the handset, pressing the CALL button of the incoming call, or
pressing SPKR . Calls answered by pressing CALL or SPKR will be routed to the speakerphone. If the
speakerphone function has been disabled, for either the non-secure or the secure mode, or both, the call
will be connected but not audible. Under this condition, to speak or listen to the caller, you must lift the
handset. Depending upon the configuration of the communicating sets, an answered call may be
connected in any of the three call modes (non-secure voice, secure voice, or secure data).
7-4.3 TRI-TAC - Call Hold
You may use the TRI-TAC “Call Hold” function to place STE calls on hold. To place a call on hold, press
the
HOLD button. When a call has been placed on hold, the CALL indicator associated with the call
placed on hold will flash (0.2 seconds on, 0.8 seconds off).
7-4.4 TRI-TAC - Call Transfer
There is no “Call Transfer” function available for TRI-TAC.
7-4.5 TRI-TAC – Conference Call
There is no “Conference Call” function available for TRI-TAC.
7-4.6 TRI-TAC - Calls To and From PSTN Terminals
When the initiator of a call is strapped as Traditional, STE TRI-TAC users can place and receive secure
calls to/from terminals connected to a PSTN network. Two network configurations are accommodated as
shown in the
Figure 7-35 below.
Figure 7-35. TRI-TAC to PSTN Phone Call Diagram
Network Case #1 with an Inter-Working Function (IWF) provides the required modulation and network
signaling conversions and serves as a secure gateway between PSTN (including ISDN networks) and the
TRI-TAC networks. In Network Case #2 without an IWF, the TRI-TAC switch provides modulation
conversion only (TRI-TAC CVSD – PSTN analog) and the STEs negotiate a signaling protocol compatible
with both network types. In both cases, the dialing procedures are similar, but each is dependent on the
particular network switch dialing requirements. The following is an example of a dialing procedure that
requires the dialing of two independent number sequences. Another switch might only require the dialing
of one number sequence that includes a dial code prefix that accesses an appropriate switch output
channel.
INCOMING CALL LINE1:
Network
Case #1
Network
Case #2
Party #1
(PSTN)
Party #2
TRI-TAC
Public
Switch
TRI-TAC
Switch
IWF
Party #1
(PSTN)
Party #2
TRI-TAC
Public
Switch
TRI-TAC
Switch
(Analog/
CVSD)