Chapter 34 Call Services
ISG50 User’s Guide
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However, for extensions for which you do not enable the call waiting feature, the following happens.
Figure 357 The Flow to Check Whether The Receiver Is Busy Or Not
When B is busy, additional calls will hear a busy tone and then the ISG50 will handle the calls
according to what you configured in the Busy Forward setting configured in the extension’s Call
Forward screen for the extension number (see Section 29.3.2 on page 463).
34.4.1 Configuring the Call Waiting Screen
Use this screen to configure call waiting on the ISG50. Click Configuration > PBX > Call
Services > Call Waiting to open the screen as following.
Figure 358 Configuration > PBX > Call Service > Call Waiting
Table 192 No 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 between caller A and B. Then B is busy.
5. Caller C makes a
call to caller B.
6. The ISG50 routes the call to B at
extension 1001.
7. B replies with a
busy tone.
8. The ISG50 handles the call (from C) by
following extension B’s Busy Forward
setting.
Incoming
call to
extension
B
B is
busy?
Yes
Forward the
call to the
extension B
Check the
Forward
setting
Busy
Forward the
call to the
extension C
Play a voice
mail
Disable AA
Auto Call
Back
No