Siemens HICOM 300 - Manual (Page 17)

17
Extending outgoing call to extension
using Trunk Call Charge key
Prior to extending an outgoing call to an extension the Trunk Call Charge Key
may be activated.
What you have to do What happens
Depress
1
Extend call in normal manner
Once the call is completed
1
LED on
Depress
1
Display shows
DIALLED NO EXT NO COST
4074111 2250 0.48