You can establish a three-party conference, during the conversation three phone parties can communicate with each other. 

To establish a conference: 

1. Press the Conf softkey during an active call. 
2. The first call is placed on hold. You will hear a dial tone. Dial the number to conference in, then press the Send softkey. 

3. When the call is answered, the conference call will now include you and the other two parties. 
4. During the conference, press the Split softkey to split the conference into two hold lines, and press the Resume softkey to resume the chosen call respectively. 
5. Hang up to disconnect all parties.