What happens if zioper app softphones add the same SIP account: ie: load the QR code for Freshphone account onto both my and my kids's cell phone apps?
Will all of them use the same account and ring simultaneously if called externally/?
The SIP account can only be "online" on a single device at a time.
If you use the same account on more than one device it would depend on which one registered last, the extension will attempt to reregister after some time so this will result in you not knowing which device is active.
We don't recommend this, as it would be much more effective to add individual accounts, remember Freshphone - Freshphone calls are "on-net" so they are not charged for.
Have a fantastic day further.