Panasonic KX-TD1232 Manuel D’Utilisation

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Station Features and Operation (DPT/SLT)
146
User Manual
If you want to return to the held call, press the TRANSFER button or corresponding CO 
or INTERCOM button before the destination party answers.
If you want to join the conversation after transferring the call or while hold recall tone 
is sent, press the corresponding CO button. A conference call is established.
<ISDN Telephone>
This feature is not available for ISDN telephones.
Programming Guide References
[206] Outside-to-Outside Line Call Duration Time
[503] Call Transfer to Outside Line
[601] Class of Service
Features Guide References
Hold Recall