One or more computer readable media, methods and systems that allow phone calls involving a mobile telephone to be to be conducted using VOIP technology with header compression of the voice packets and dynamically adjustable tiered subscriber service. A dynamic, tiered-subscriber service allows the bandwidth allotted to users subscribing to different levels of service to be adjusted between sessions to accommodate changing network conditions. Header compression involves compressing the voice packet header into a reduced number of bites. Embodiments of the present invention enable simultaneous header compression and dynamic tiered-subscriber service through a new call flow set up that includes a new policy. The new policy is given preference over the other installed policies and includes new attribute value pairs that enables both header compression and dynamic bandwidth adjustments.