A freespeech VOIP line can support many calls at the same time. The number of calls is only limited by your broadband capacity.
Because calls occupy a 'virtual channel' you don't need a pair of wires for every call. If you are using a regular phone this means you can place a call 'on hold' while talking to another person. If your phone is a more advanced VOIP phone with 'line' buttons, you can switch between many calls or enter a 3 party call.
If you want to talk to more than one caller at a time, you can use multiple phones.
lf you are using an IP PBX it means you can have as many incoming and outgoing calls as your bandwidth can take, at the same time.
*This feature requires phone support