My name is Erik Hanley and I'm a Call Center Expert and Senior Analyst Programmer with more that 15 years of experience. If you need help to set up a call center/PBX phone app, you need to evaluate your needs and budget and then look for the telecom providers. Using VOIP providers Vs traditionnal phone lines will impact the cost and phone line qualities.
If you need help to set up your telecoms for your small business/start up, i'm the good person to help you. I will be happy to help you on a call.
Depends on how into the weeds you want to be, what your regulatory requirements are.
Close.Com works as a really good "all in one" CRM. I love a lot about the way that it works and it tracks calls.
I'm currently using Nutshell which works really well, with a couple of caveats (not texting) well.
For email, nothing beats ActiveCampaign for features, and ConvertKit for creating inside the platform.