Hi, it seems - independent of what I do with my gatekeeper.ini - I always get " H245 Write PDU fail: no control channel", when I try to use the cisco callmanager as gateway. What does that mean? :-( I get the callmanager registered now: RCF|192.168.103.33:1720|ccm:h323_ID|gateway|9700_endp RCF|192.168.111.135:1720|oliver:h323_ID|terminal|6430_endp And I can call another ohphone controlled by the gnu gatekeeper: ; ACF|192.168.166.9:1720|9701_endp|3752|oliver:h323_ID|zi:h323_ID|false; ACF|192.168.111.135:1720|6430_endp|3752|oliver:h323_ID|zi ACF|[192.168.111.111]:h323_ID|true; But, when I try to call a phone of the cisco device pool - for example an H.323 Ohphone or an Cisco IP Phone - the called user cannot be found: Command ? c 1507 zi is calling host 1507 Command ? 5:43.342 H225 Caller:8092998 h323.cxx(3091) H245 Write PDU fail: no control channel. 5:43.586 H323 Cleaner h323.cxx(1524) H323 Connection ip$localhost/3753 terminated. Gatekeeper could not find user "1507" Because I only see the port 1720 open on the callmanager, I changed the default CallSignalPort 1721 also to 1720 on the gatekeeper. After hours of testing, I'm absolutely clueless if the problem is in the gatekeeper.ini or in callmanager 4.0. It would help me to know, if anybody out there ever had a working ohphone with callmanager as gateway. Oliver ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click _______________________________________________ List: Openh323gk-users@xxxxxxxxxxxxxxxxxxxxx Archive: http://sourceforge.net/mailarchive/forum.php?forum_id=8549 Homepage: http://www.gnugk.org/