An emerging use of wireless local area networks (LANs) is to carry voice traffic. Hospitals have spearheaded adoption, with retailers and facilities managers also using it. Voice over wireless IP has a security drawback: Any authentication technology more powerful than the wired equivalency privacy (WEP) will cause delays of several seconds as users roam from one access point to another. WEP is easily hacked and is not considered appropriate for business, education or government deployments.Fortunately, there are several techniques to get around these limits.”]
Source: https://www.csoonline.com/article/2118714/special-concerns-for-voice-over-wireless-ip.html