I'm planning on getting Zoiper5 Pro because I need to do conference calls, and I already have a VoIP provider and a number, I've been using the number and Zoiper to answer incoming calls.
Now I need to know if it's required for me to dial out to the other 2 parties involved (3 way call) to make a conference, or if I can just have the other 2 parties call ME, so I can place one on hold to then answer the second call and finally merge us all into a 3 way call.
Hope it's clear enough.