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Andreas.Eversberg Andreas.Eversberg at versatel.de> If anyone wants to look further into this, I'm happy to record some PCAP files with some example RTP/RTCP dumps. If you want, even combined with the TCP connection to the BSC, so you have a correct timeline and know what the BSC told the BTS when, and how the BTS reacted to that. i would like to see some of this payload, but without any BSC traffic. when i see in the future, i see that a bts directly forwards rtp data to remote sip phone or media gateway or other bts. therefore it must be a standard. i think it is gsm audio coded.