Please note that when you configure Cluana with a VoIP carrier, the voice quality achieved is dependent upon:
1) your broadband connection
2) your VoIP service provider
As both aspects are outside our control we are not able to guarantee that you will be able to achieve the voice quality required. However you are welcome to use Cluana services with your preferred VoIP provider by configuring the SIP trunks on the admin web interface of the pbx.