hi, i just tested a new version from 21.01. (FreeSWITCH Version 1.0.pre3 (7309M)). If i call a phone from FreeSwitch i hear in phone robot like voice, direction phone -> FreeSwitch is ok (i use FS on WinXP). A look to wireshark shows that FreeSwitch send all 60ms 3 packets with the same timestamp, in versions before timestamp was always incremented by 160 to be synchron to RTP data bytes. I remembered the same error was already there: http://jira.freeswitch.org/browse/MODENDP-40 and than fixed. Is it now back? or another bug? In this version i got also some CRITs, may be this has the same cause: 2008-01-23 11:47:50 [CRIT] switch_time.c:387 softtimer_runtime() Forward Clock Skew Detected! 2008-01-23 11:48:03 [CRIT] switch_time.c:387 softtimer_runtime() Forward Clock Skew Detected! 2008-01-23 11:48:54 [CRIT] switch_time.c:387 softtimer_runtime() Forward Clock Skew Detected! 2008-01-23 11:50:56 [CRIT] switch_time.c:375 softtimer_runtime() Reverse Clock Skew Detected! 2008-01-23 11:55:36 [CRIT] switch_time.c:387 softtimer_runtime() Forward Clock Skew Detected! so i went little bit deeper and come to Sleep() method from windows. this sleep is very inaccurate, it counts in 15ms steps, so a sleep(1) is the same as sleep(15). my idea was to implement a better timer with WaitableTimer and Wait For SingleObject. now i have a timer with 1ms resolution, but the problem remains :( regards, Thomas