Add -DP_64BIT in the Makefile for LOCAL_CFLAGS and rebuild the module. Mod_h323's Makefile doesn't detect the platform automatically for you... I tried this myself a couple of days ago, and it seems to work. /Peter Från: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] För afshin afzali Skickat: den 26 oktober 2010 12:47 Till: freeswitch-users Ämne: [Freeswitch-users] Error Loading mod_h323 Hi Guys, I've successfully made & installed mod_h323 on CentOS 5.5 x86_64 bit OS. But It can not be loaded because this : freeswitch@internal> load mod_h323 +OK Reloading XML -ERR [module load file routine returned an error] 2010-10-26 14:04:50.438317 [INFO] mod_enum.c:808 ENUM Reloaded freeswitch@internal> 2010-10-26 14:04:50.438317 [INFO] switch_time.c:950 Timezone reloaded 530 definitions 2010-10-26 14:04:50.494262 [CRIT] switch_loadable_module.c:928 Error Loading module /usr/local/freeswitch/mod/mod_h323.so **/usr/local/freeswitch/mod/mod_h323.so: undefined symbol: _ZN14H323Connection24OnUserInputInlineRFC2833ER15OpalRFC2833Infoi** Although I've found a same thread on this list "Mod_h323 on openvz (64 bit)", it seems did not get final response. Maybe it's about loading another share library which is not in path (LD_LIBRARY_PATH ?) Appreciate all comments, -- afshin !DSPAM:4cc6b31132935800614202!