Evaluation of CRTP performance over cellular radio links

To make mobile IP telephony over cellular radio systems an economically via ble alternative to circuit-switched voice, it is an absolute requirement th at the 40-octet IP/UDP/RTP headers on IP telephony packets be reduced in si ze to conserve bandwidth and radio spectrum. We evaluate the performance of the default header compression scheme for IP/UDP/RTP, CRTP (RFC-2508), ove r links built on cellular radio access technology. We find that CRTP does n ot perform adequately over such links, and suggest that a more robust heade r compression scheme must be developed to make IP telephony over cellular e conomically viable.