I just upgraded my asterisk install from january 2005 CVS HEAD to current CVS HEAD : * zaptel * libpri * asterisk My asterisk have one TE405P with one span (the clock source) pluged into a telco PRI E1, a second span is a PRI E1 to another PBX and the third one is a T1 to a rhino channel bank. Everything went smoothly except that the two PRI span restart every ten seconds after some HDLC abort errors : Aug 26 20:04:15 NOTICE[20571] chan_zap.c: PRI got event: HDLC Bad FCS (8) on Primary D-channel of span 2 Aug 26 20:04:15 NOTICE[20571] chan_zap.c: PRI got event: HDLC Bad FCS (8) on Primary D-channel of span 2 Aug 26 20:04:30 NOTICE[20571] chan_zap.c: PRI got event: HDLC Abort (6) on Primary D-channel of span 1 Aug 26 20:04:30 NOTICE[20571] chan_zap.c: PRI got event: HDLC Bad FCS (8) on Primary D-channel of span 2 Aug 26 20:04:55 NOTICE[20571] chan_zap.c: PRI got event: HDLC Abort (6) on Primary D-channel of span 1 Aug 26 20:05:10 NOTICE[20571] chan_zap.c: PRI got event: HDLC Abort (6) on Primary D-channel of span 1 Aug 26 20:05:10 NOTICE[20571] chan_zap.c: PRI got event: HDLC Abort (6) on Primary D-channel of span 2 Aug 26 20:05:55 NOTICE[20571] chan_zap.c: PRI got event: HDLC Abort (6) on Primary D-channel of span 1 ... I can place and receive calls but they are randomly droped and full of clicks After reverting only the zaptel driver everythings works normaly again. One of the reason that lead me to do the upgrade is to test the new echo canceler. But unfortunatly, I can't test it as it's in the zaptel modules. Any ideas. cyril