The high development that mobile networks and the provided services have experienced in the last few years has involved a great scientific and technical effort in order to support quality of service mechanisms for mobile users. In the case of mobile ad hoc networks (MANETs) this effort is even more noticeable due to the complexity of the dynamic environment of these networks. An appropriate resource allocation capable of integrating multimedia services with different requirements implies the design of efficient call admission control (CAC) techniques that in this ad hoc scenario require a distributed operation. This operation can be performed through a QoS routing process based on a cross-layer design. The interlayer cooperation allows to define new QoS metrics that reflect the network resource utilization and a bandwidth reservation carried out according to the different service demands during the path discovery guarantees the quality of the admitted connections