AASTRA 6739i for Aastra 800 and OpenCom 100 User Guide EN - Manual (Page 31)

Operating Aastra 6739i SIP Telephone
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1. Press the Call waiting protection function key to activate call protection.
The softkey lights up red. While you are telephoning, other calls will not be sig-
nalled by a call-waiting tone; the caller hears the busy tone.
2. Press the function key once again to deactivate the call waiting protection
function.
Tip: Call waiting protection can also be set using the main menu:
5 Protection > 8 Call wait. prot. (see page 37).
Note
Call waiting protection is only in effect on the terminal where it was activated. If the
internal call number of the terminal is available multiple times (i.e. on other terminals
as well), call protection is not automatically activated on them.
Telephone Lock
You can lock the Aastra 6739i SIP telephone to prevent unauthorised use. You must
use your user PIN to unlock the phone. This function can also be executed via a Phone
lock function key (see Programming Function Keys starting on page 45).
Locking telephone
The Phone lock function key is labelled Lock.
1. Press the Lock key.
The key is now labelled Unlock and outlined in green. Display shows: Phone
is locked.
When the phone is locked, emergency calls to predefined call numbers can still be
made. The admitted call numbers depend on the special lists assigned to the user
group (Telephony: Lists: Special lists menu). The default contains the 110 and 112
call numbers.
Unlocking telephone
1. Press the Unlock key.
The Phone is locked menu card appears.
2. Press the Unlock the phone softkey.