Yes, VoIP can be very reliable, despite concerns surrounding cloud-based calling.
F A Q | Is VoIP Reliable?
Ensure that you have adequate bandwidth for the number of concurrent calls you might make, number of phone lines, other apps you may have running.
VoIP is statistically a better choice than PSTN for small to medium-sized businesses for many reasons such as more mobility, functionality, cost-savings, etc.
Businesses that need to scale or expand global reach will benefit greatly from VoIP. Along with this, businesses that need to access call data for analysis purposes can use VoIP to improve themselves.
Your provider should supply you with information pertaining to the quality of the service delivered. This can include expected uptime, call quality, troubleshooting assistance, and other essential information.
Compared to PSTN, VoIP is more cost-effective, can provide advanced voice calling features, is more commonly used than landlines, adds geographic mobility, and continues to evolve.