Recommendations for the Best VOIP Phone Service for High-Volume Call Centers

I suggest going for a CCaaS instead of a basic VOIP PBX. Amazon Connect or Twilio Flex integrate seamlessly with Salesforce and HubSpot, offering a cleaner scaling solution. Connect with Salesforce Service Cloud Voice is the fastest to set up—you’ll get features like skills-based routing and queue callbacks right out of the box. Flex is awesome for customizing workflows using Salesforce Open CTI or HubSpot APIs. If remote agents are involved, make sure to use WebRTC softphones and check your network quality settings to ensure smooth operations.

It really depends on your specific setup size. I’ve found Cisco/Webex Contact Center to be a robust option, but it does come with a challenging learning curve. However, if you're looking for something that supports remote agents without constant supervision, it can definitely work—just make sure to weigh the benefits against the complexity involved.

I've been using voip.ms for nearly 20 years now, and it’s been great. They offer both hosted VOIP as well as SIP or Asterisk trunking options packed with features like TLS, SRTP, and a REST API for easy integrations. They even have a basic IVR for routing if you don't have overly complex needs. What's really nice is that the pricing is pretty reasonable, usually about $1 per number each month, plus pay-per-minute usage.

At my workplace, we recently switched to FreePBX as our VOIP solution after moving away from Mitel. It's got a lot of features you'll find handy, and it scales well. A tip: if you go with FreePBX, definitely pay for the high availability version and ensure your server hardware is up to the task. There are tons of YouTube tutorials to guide you through the setup. Just be ready to learn the system—there can be a bit of a learning curve!