1. A method for providing admission control in a communications network, the method comprising: at a first device, receiving a request for a new session in a communications network, the request comprising a priority class, a service type, and session characteristics; identifying an occupancy threshold value associated with the priority class, wherein the occupancy threshold value is predetermined; identifying a burst time threshold value associated with the priority class and the service type, wherein the burst time threshold value is predetermined; identifying a target delay threshold value associated with the priority class and the service type; calculating an end-to-end delay value based on the identified occupancy threshold value, the burst time threshold value, and the session characteristics; comparing the calculated end-to-end delay value with the identified target delay threshold value to determine if a delay threshold is satisfied; and admitting the new session in the communications network if the delay threshold is satisfied.