Hi, if you are using H.239, you should update to the latest code from Github. A number of bugs have been fixed in the H.239 code recently. If you still see issues, please let me know. https://github.com/willamowius/h323plus As part of the H.239 testing, I also added H.239 support to the call generator (--h239enable) as well as RTP fuzzing (--fuzzing). Its amazing how many commercial H.323 endpoints crash when you apply some RTP or RTCP fuzzing. ;-) https://github.com/willamowius/callgen323 Regards, Jan -- Jan Willamowius, H323Plus maintainer EMail : jan@willamowius.de H.323 Support: https://www.willamowius.com/h323plus-support.html Relaxed Communications GmbH Frahmredder 91 22393 Hamburg Geschäftsführer: Jan Willamowius HRB 125261 (Amtsgericht Hamburg) USt-IdNr: DE286003584