Much like any system attached to the internet, VoIP phones are susceptible to cybercrimes, including hack attacks.
Hackers can access your personal information by taking advantage of the fact that most VoIP deployments are connected to the internet and don’t have a firewall in place.
Hacking can also be used to falsify caller ID information, which can trick a person into answering a call that appears to come from someone they know or trust.
The best way to combat these cyber threats is to choose a VoIP provider that proactively takes security measures to protect its users.
Among various steps, they should provide encryption, actively monitor the infra for threats, and keep their technologies up to date.