Siemens 150 用户手册

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页码 20
9
Call Back
Call Back requests can be left on extensions which have been rung and not
answered or are busy.
Activate Call Back - Busy
- called extension is busy
- press Recall 
*****
 77
- confirmation tone is heard
- replace handset
The system will automatically call you back when both your extension and the
called extension are free.
- lift handset
- ring tone is heard as the required extension is rung
Activate Call Back - No answer
- called extension does not answer
- press Recall 
*****
 77
- confirmation tone is heard
- replace handset
When the called party returns to the office and has used the telephone the
system will ring your telephone.
- lift handset
- ring tone is heard as the required extension is rung