QUESTION Incredible PBX and VPN

[PBX Novice]

I currently run our PBX hosted in the cloud hosted on Amazon AWS running Ubuntu. We have phones in 2 different locations with different IPs. Occasionally, Verizon decides to change the IP on our location wreaking havoc on a white list locked down PBX. I know very little about VPNs but was told that one might alleviate my changing IP issue. Would someone be able to advise?

Thanks in advance

 

[AndyInNYC]

Another solution would be to configure whitelisting using TM3 on each of the remote locations. Run a DDNS program on the router/remote machine to update the server and whitelist the location that way. Have the ipchecker program run via cron every [4] minutes, and your phones should stay online for most of the time.