When preparing VoIP network for real-time voice and video over IP, network IT managers must assess whether their network can provide and maintain the expected quality of service (QoS). Going ahead with voice and video over IP means making informed decisions about network devices to deploy, bandwidth requirements, and optimal network configuration required. Proactive and passive methods are needed to ensure network readiness before voice and video services are deployed on it, as the success of these services depends on the ability of the network to support them.