parts of H.225.0 - RAS, Q.931, H.245 RTP/RTCP and audio/video codecs, such as the audio codecs (G.711, G.723.1, G.728, etc.) and video codecs (H.261, H.263) that compress and decompress media streams. Media streams are transported on RTP/RTCP. RTP carries the actual media and RTCP carries status and control information. The signalling is transported reliably over TCP. The following protocols deal with signalling: RAS manages registration, admission, status. Q.931 manages call setup Steelton dial up internet access, Steelton, PA up internet access dial SteeltonSteelton up internet access, dial Pennsylvania, Steelton dial up internet access
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