I have positive feedback about all systems mentioned above. VOIP phones are so common now that it can come down to the user and how comfortable you are with the interface.

I'll also advocate for Phone Burner.

Phoneburner - Offers a 7 Day Trial Period. Simultaneously Voicemail Drops & E-Mails. Will absolutely help increase productivity and efficiency if used properly.

https://www.phoneburner.com/homepage...-sign-up/index