Technical Reference for ZyXEL omni.net series
5-2
can invoke all the supplementary services by using a single key on your telephone keypad: the
Flash key.
To assign the flash key to enable supplementary service, issue the command
[ATS120.7=1&W0Z0].
Call Waiting
Call waiting allows you to put a call on hold while you answer another incoming call on the same
phone (directory) number.
The command register S79 controls the operations of call waiting. By default, call waiting is
enabled on both phone ports. You can use the S79 settings to enable/disable call waiting, as follows:
Call Waiting
S Register
Description
S79.2=1
Enable Call Waiting on POTS port 1 (default).
S79.2=0
Disable Call Waiting on POTS port 1.
S79.3=1
Enable Call Waiting on POTS port 2 (default).
S79.3=0
Disable Call Waiting on POTS port 2.
Table 31. Call Waiting S Register
There are several ways of using call waiting to deal with an incoming call:
Put your current call on hold and answer an incoming call
Step 1.
You are currently on an active call between A and B.
Step 2.
You hear an indicator tone signaling an incoming call C.
Step 3.
Press and immediately release the
Flash
key.
Step 4.
This will put caller B on hold and activate the call between A and C.
Call Hold/Retrieve
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