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Reference Guide for the Model RT338 ISDN Router
Advanced Phone Features
10-3
 
Three Way Calling
The Three Way Calling feature lets you add a third party to an existing call. You must subscribe to 
this service with your telephone company. 
To add a third party to an existing call: 
1.
Press the flash hook button and immediately release it to put the existing call on hold and 
receive a dial tone. 
2.
Dial the phone number of the third party. 
3.
When you are ready to conference the calls together, press the flash hook button and 
immediately release it to establish a Three Way Conference Call.
To drop the last call added to the three-way-call:
Press the flash key. 
The last call added to the conference is dropped. 
To drop yourself from the conference call: 
While the two other callers remain on the line, hang up your phone. The ISDN network does 
an implicit transfer to directly connect the two remaining callers. 
Note: 
If you want to cancel your attempt to establish the conference call because the 
third party’s line is busy or does not answer, simply hang up the phone and pick it back 
up after it starts ringing to return to the first caller.