Depending on your SIP Phone, cou can create a conference with other parties using the phone’s local conference feature. You can create a conference between an active call and a call on hold (on the same or another line) by pressing the CONF key.

To set up a local conference call: 

1. Place a call to the first party. 

2. Press CONF to create a new call. The active call is placed on hold. 

3. Enter the number of second party and press OK or #. 

4. When the second party answers the call, you can consult with him or her before adding to the conference. 

5. Press CONF again to join all parties in the conference.