User's Guide

Call Type Answering Method Audio Routing
Press extension-head PTT. To the extension-head microphone and to the
external speaker.
Using AT commands (virtual
PTT).
To one of the following routes, by priority:
• To the handset RAC if taken off hook.
•
To the handheld microphone RAC if taken
off hook.
• To the hands-free microphone RAC.
• To the line-in.
• To the handset front-head if taken off hook.
• To the handset back-head if taken off hook.
• To the HSM front-head.
• To the HSM back-head.
• To the handheld microphone front-head.
• To the handheld microphone back-head.
• To the headset / PHF front-head.
• To the headset / PHF back-head.
• To the hands-free microphone back-head.
5 6
Group Call Not applicable. Routing is as follows:
• To the external speaker on the transceiver.
• To the handset of the transceiver if taken off
hook.
• To one of the following routes, by priority:
- To the IMPRES handset earpiece if the
IMPRES handset is taken off hook.
- To the HSM / HSM2 earpiece if the
HSM / HSM2 is connected to the control
head.
- To the GCAI headset / PHF earpiece if
the GCAI headset / PHF is connected to
the control head.
- To the external speaker.
5
NOTICE: There is one PTT line from the Junction Box. When pressing PTT, the active mic (on
TELCO or hands-free microphone) depends on TELCO hook signal:
• if OFF hook, TELCO mic is opened,
•
else, hands-free mic is opened.
6
Available only for radios with Multi Radio Control feature enabled. There is only one receiving
audio path on the control head (front-head GCAI OR back-head GCAI). In case both the hand-
set and external speaker are connected to control head, handset shall have a priority for re-
ceiving audio if it is taken off hook.
68015000180-MG
Appendix D:
Audio Routing and PTT Hook Interactions
153