This describes the steps to be able to conference 2 numbers on locations using Cisco phones.
1) Start by being on the phone with one party.
2) Press the more button until you see the option for 'Confr"
3) Press the "Confr" button. This places the first call on hold.
4) Dial the second number.
5) Press the "Confr" button again to join both lines into a conference.