ZyXEL Communications ISG50 User Manual
Chapter 34 Call Services
ISG50 User’s Guide
536
34.4 The Call Waiting Screen
Call waiting allows you to put a present call on hold and answer a new call. When a second call
comes in, the ISG50 sends a beep tone to you. You can decide to ignore it or to switch to the
second call using one of the following methods.
comes in, the ISG50 sends a beep tone to you. You can decide to ignore it or to switch to the
second call using one of the following methods.
• press the flash button on your telephone
• very quickly press and release the on-hook switch on your telephone
• very quickly press and release the on-hook switch on your telephone
You can switch back to the first call using the same methods above. When you hang up one call, the
ISG50 sends you a ring tone if another call is still waiting.
ISG50 sends you a ring tone if another call is still waiting.
Note: This feature only applies to extension receivers which use SIP or analog phones.
The following figure shows how call waiting works.
Figure 356
Call Waiting Overview
Table 191
Call Waiting Example
CALLER A
CALLER C
ISG50
RECEIVER B
1. Caller A makes a
call to caller B.
2. The ISG50 routes the call
to B at extension 1001.
3. B picks up the call.
4. Conversation established between caller A and B
5. Caller C
makes a call
to caller B.
to caller B.
6. The ISG50 routes the call
to B at extension 1001.
7. B hears a beep tone and decides
to answer the second call. B then
presses the flash button on his
telephone).
presses the flash button on his
telephone).
8. Conversation established between caller C and B. Caller A is on hold. B is busy.
ITSP
ITSP
ITSP
A
A
A
B
B
B
C
C