You can host a conference call with up to two other parties using Cisco Phone; to host a conference using your SPA525 or SPA525G2, follow the instructions below to know how.
To initiate a conference call:
Press the Conf button during an active call. The first call is placed on hold, a second line is opened, and you hear a dial tone.
Dial the second person’s telephone number.
Press the Conf button again. All three parties are connected in the conference call. When you hang up, the other two parties are disconnected.
If you want to disconnect and keep the other parties connected, press Join.