Chapter 22 VoIP
EX5501-B0 / AX7501-B0 / PX7501-B0 User’s Guide
262
Note: To take full advantage of the supplementary phone services available through the
Zyxel Device's phone ports, you may need to subscribe to the services from your VoIP
service provider.
22.9.2.1 Flash Key
Flashing means to press the hook for a short period of time (a few hundred milliseconds) before releasing
it. On newer telephones, there should be a "flash" key (button) that generates the signal electronically. If
the flash key is not available, you can tap (press and immediately release) the hook by hand to achieve
the same effect. However, using the flash key is preferred since the timing is much more precise. With
manual tapping, if the duration is too long, it may be interpreted as hanging up by the Zyxel Device.
You can invoke all the supplementary services by using the flash key.
22.9.2.2 Europe Type Supplementary Phone Services
This section describes how to use supplementary phone services with the
Europe Type
Call Service
Mode
. Commands for supplementary services are listed in the table below.
After pressing the flash key, if you do not issue the sub-command before the default sub-command
timeout (2 seconds) expires or issue an invalid sub-command, the current operation will be aborted.
European Call Hold
Call hold allows you to put a call (
A
) on hold by pressing the flash key.
If you have another call, press the flash key and then “2” to switch back and forth between caller
A
and
B
by putting either one on hold.
Press the flash key and then “0” to disconnect the call presently on hold and keep the current call on
line.
Press the flash key and then “1” to disconnect the current call and resume the call on hold.
If you hang up the phone but a caller is still on hold, there will be a remind ring.
Table 111 European Flash Key Commands
COMMAND
SUB-COMMAND
DESCRIPTION
Flash
Put a current call on hold to place a second call.
Switch back to the call (if there is no second call).
Flash
0
Drop the call presently on hold or reject an incoming call which is waiting for
answer.
Flash
1
Disconnect the current phone connection and answer the incoming call or
resume with caller presently on hold.
Flash
2
1. Switch back and forth between two calls.
2. Put a current call on hold to answer an incoming call.
3. Separate the current three-way conference call into two individual calls
(one is on-line, the other is on hold).
Flash
3
Create three-way conference connection.
Flash
*98#
Transfer the call to another phone.