Is it possible to purchase another number from another country while my current number is active ?
Sure thing , you can also send the calls to the same destination, or separate.
Okay perfect, im using Zioper app , can i receive calls from both number on my Zioper app ??
Yes you can, just set the 2 phone number modules in PBX attached to the same person module
I still can't register my SIP account into the Zioper app, It's saying Unauthorized(401) please help out,.
Perhaps your IP address was banned for too many failed attempts, please try to ping the SIP server and if its unreachable PM your IP address