Hi, I have enclosed a short part of my log. The problem is that an extension cannot give a call to an other extensions. Both extensions are registered correctly. Firewall ist not a problem: These extensions were already be able to be called same days ago within the same LAN. The NAT / Firewall-Settings ware not changed. Something was changed in FusionPBX or FreeSwith which makes the system wrong. Could you help me? What I have already made: - external.xml and internal.xml were recovered - FreeSwitch was restarted - all extension have "public" in user context LOG: http://pastebin.com/JxUBANaV Thank you very much for your help. Regards, I.