What is a disadvantage of using VoIP?

Answer 1

Poor internet connection will result in jitter or broken sound (typical cable and ADSL connections do not come with service level agreements of any merit). Cost to maintain smaller deployments can be expensive for the number of end points. Improperly configured systems can be penetrated resulting in the system being hijacked. Conversations are not usually encrypted creating a potential security issue. Internal networks must have capacity and the ability to prioritise the voice traffic to maintain sound quality. VOIP termination and origination providers tend to frequently go out of business causing outages. Failed VOIP origination service providers often are not available to assist with the recovery of the end user's phone number from their upstream provider resulting in a delay in recovering or the loss of that/those number(s).