Robust Header Compression (ROHC) has recently been proposed to reduce the large protocol header overhead when transmitting voice and other continuous meadi over IP based control stacks in wireless networks. In this paper we evaluate the real-time transmission of GSM encoded voice and H. 26L encoded video with ROHC oevr a wireless link. For the voice transmission we examine the impact of ROHC on the consumed bandwidth, the voice qaulity, and the delay jitter in teh voice signal. We find that for a wide rang of error probabilities on teh wireless link, ROHC roughly cuts the bandwidth required for the transmission of GSM encoded voice in half. In addition, ROHC improves the voice quality compared to transmissions without ROHC, especially for large bit error probabilities on the wireless link. the improvement reaches 0.26 on the 5-point Mean Opinion Score for a bit error probability of 10(-3). For the video transmission we examine the impact of ROHC on the consumed bandwidth. We find that the bandwidth asvings with ROHC depend on the quantization scale used for the video encoding and the video content and ranges between 5-40% for typical scenarios.