A telephone system supports communication with user devices over both a cellular radio network as well as over an Internet Protocol network, and enables roaming and active call handoff between cellular and IP domains. In particular, collateral ventilation of a target compartment within a lung of a patient is assessed by advancement of a catheter through the tracheobronchial tree to a feeding bronchus of the target compartment. A loader foot is carried by the frame’s bottom surface for applying force to a microcircuit. A status report is generated for each acknowledge mode RLC instance mapped to the HS-DSCH by a radio link control device after the MAC-hs flushes the reordering buffer.