M3SR Series 4100 Selecting the Service Mode
4.168 Operating Manual 6175.4760.02 – 01
VOICE_O_IPD
Voice transmission can be initiated by any 
PTT key line. Data transmission is started 
when IP data is detected at one of the IP inter-
faces (Ethernet or PPP via serial interface) if 
no voice PTT is active.
If a PTT signal is activated during data trans-
mission, the data link is interrupted and a voice 
link is established to the selected station(s). 
Voice has priority over data. The called sta-
tion(s) automatically detects the service type 
and reacts adequately.
Softkey Type Description