How do I make a 3-way conference call on my SNOM phone?

Description

How do I make a 3-way conference call on my SNOM phone?

Resolution

1. Assuming the current call is on line 1, then press line 2.  This will automatically put line 1 on hold.
• each line is usually located on the lower right side, an active call has a green LED light.
  
2. Dial the extension number of phone number then press OK (checkmark button).
3. Once line 2 has an active conversation, press the "Cnf.On" key to merge both lines into a 3-way call.
• the key is located on the display screen like below