With the full time dispatcher, the experience of a driving position seems invaluable because it gives the person first-hand experience of the conditions drivers face. Without understanding the challenges of driving it is unfair for the dispatcher to make judgements about the driver's abilities and in turn the work they are assigned. These methods are arranged by expense, beginning with the least expensive. The pager option is probably the least expensive but limits the communication to one way or at best a call back later. This is quick two-way contact, however there are different frequencies at which radio networks operate.
Some offerings share communication with other companies.
An example is when a cement truck company and a garbage collection service might share the same airways with each other. In this case, dispatchers must be respectful of the other companies on the radio, including waiting for open air to communicate to your fleet. The other option in two-way radio is a private frequency. This will provide direct and immediate contact to your driving staff. The cost for this is up-front dollars for the communication hardware and monthly fees for air time.