Guys, As I see, for many of us "audio lost" issue makes chan_ss7 unusable. I was trying to look at the code of chan_zap and see how the ISDN-PRI and R2 made there. Looks like the implementation of the chan_zap differs from chan_ss7 in meaning of working with zaptel - but I'm yet unable to get a key points, whay PRI does not have an audio-lost problem but chan_ss7 has. Maybe the reason in only because chan_zap got internal JB. Can anyone else look at the code too? Regards, Anton.