My hardware is OpenVox. Newer kernels/dahdi have a dahdi_no_read/write function set that returns ENOSYS. This appears to confused FreeSWITCH which then says: 2015-06-25 19:42:56.390679 [DEBUG] ftdm_config.c:52 New mod directory: /usr/local/freeswitch/lib/freeswitch/mod 2015-06-25 19:42:56.390679 [DEBUG] ftdm_config.c:58 New config directory: /usr/local/freeswitch/etc/freeswitch 2015-06-25 19:42:56.390679 [INFO] switch_time.c:1411 Timezone reloaded 530 definitions 2015-06-25 19:42:56.390679 [DEBUG] ftdm_sched.c:161 Initializing scheduling API 2015-06-25 19:42:56.390679 [DEBUG] ftdm_sched.c:265 Created schedule freetdm-master 2015-06-25 19:42:56.390679 [NOTICE] ftdm_sched.c:192 Launching main schedule thread 2015-06-25 19:42:56.390679 [DEBUG] ftdm_sched.c:201 Running schedule freetdm-master in the main schedule thread 2015-06-25 19:42:56.390679 [DEBUG] ftdm_config.c:80 Configuration file is /usr/local/freeswitch/etc/freeswitch/modules.conf 2015-06-25 19:42:56.390679 [NOTICE] ftdm_io.c:6387 Modules configured: 1 2015-06-25 19:42:56.390679 [DEBUG] ftdm_config.c:80 Configuration file is /usr/local/freeswitch/etc/freeswitch/freetdm.conf 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5148 Reading FreeTDM configuration file 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5165 found config for span 2015-06-25 19:42:56.390679 [NOTICE] ftmod_zt.c:1504 Using DAHDI control device 2015-06-25 19:42:56.390679 [INFO] ftdm_io.c:5548 Loading IO from /usr/local/freeswitch/lib/freeswitch/mod/ftmod_zt.so [zt] 2015-06-25 19:42:56.390679 [DEBUG] ftdm_config.c:80 Configuration file is /usr/local/freeswitch/etc/freeswitch/zt.conf 2015-06-25 19:42:56.390679 [INFO] ftmod_zt.c:601 Setting rxgain val to 0.000000 2015-06-25 19:42:56.390679 [INFO] ftmod_zt.c:609 Setting txgain val to 0.000000 2015-06-25 19:42:56.390679 [INFO] ftdm_io.c:5512 Auto-loaded I/O module 'zt' 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5186 created span 1 (FXS1to6) of type zt 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5204 span 1 [rxgain]=[0.00] 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5204 span 1 [fxs-channel]=[1-6] 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5255 setting trunk type to 'FXS' start(KEWL), mode(NET) 2015-06-25 19:42:56.390679 [ERR] ftmod_zt.c:293 failure configuring device /dev/dahdi/channel chan 1 fd 40 (No such device or address) 2015-06-25 19:42:56.390679 [ERR] ftmod_zt.c:293 failure configuring device /dev/dahdi/channel chan 2 fd 40 (No such device or address) 2015-06-25 19:42:56.390679 [ERR] ftmod_zt.c:293 failure configuring device /dev/dahdi/channel chan 3 fd 40 (No such device or address) 2015-06-25 19:42:56.390679 [ERR] ftmod_zt.c:293 failure configuring device /dev/dahdi/channel chan 4 fd 40 (No such device or address) 2015-06-25 19:42:56.390679 [ERR] ftmod_zt.c:293 failure configuring device /dev/dahdi/channel chan 5 fd 40 (No such device or address) 2015-06-25 19:42:56.390679 [ERR] ftmod_zt.c:293 failure configuring device /dev/dahdi/channel chan 6 fd 40 (No such device or address) 2015-06-25 19:42:56.390679 [ERR] ftdm_io.c:5081 1:Failed to configure span 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5204 span 1 [analog-start-type]=[kewl] 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5230 changing start type to 'KEWL' 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5165 found config for span 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5186 created span 2 (FXO1) of type zt 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5204 span 2 [name]=[Adams Family] 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5204 span 2 [number]=[435XXXXXXX] 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5204 span 2 [fxo-channel]=[7] 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5239 setting trunk type to 'FXO' start(KEWL), mode(CPE) 2015-06-25 19:42:56.390679 [ERR] ftmod_zt.c:293 failure configuring device /dev/dahdi/channel chan 7 fd 40 (No such device or address) 2015-06-25 19:42:56.390679 [ERR] ftdm_io.c:5081 2:Failed to configure span 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5165 found config for span 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5186 created span 3 (FXO2) of type zt 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5204 span 3 [name]=[Adams Family] 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5204 span 3 [number]=[435XXXXXXX] 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5204 span 3 [rxgain]=[0.00] 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5204 span 3 [txgain]=[0.00] 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5204 span 3 [fxo-channel]=[8] 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5239 setting trunk type to 'FXO' start(KEWL), mode(CPE) 2015-06-25 19:42:56.390679 [ERR] ftmod_zt.c:293 failure configuring device /dev/dahdi/channel chan 8 fd 40 (No such device or address) 2015-06-25 19:42:56.390679 [ERR] ftdm_io.c:5081 3:Failed to configure span 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5204 span 3 [analog-start-type]=[kewl] 2015-06-25 19:42:56.390679 [DEBUG] ftdm_io.c:5230 changing start type to 'KEWL' 2015-06-25 19:42:56.390679 [INFO] ftdm_io.c:5450 Configured 0 channel(s) 2015-06-25 19:42:56.390679 [ERR] ftdm_io.c:6397 FreeTDM global configuration failed! I did have to move ftmod_* from /usr/local/freeswitch/mod to /usr/local/freeswitch/libs/freeswitch/mod before I got this far. Unfortunately, I need to be using newer versions of Fedora. 21 won't compile it properly and it goes off into lah lah land the first time any call hangs up. Fedora 22, I have to change __FUNCTION__ to __func__ in some of the freetdm files to get it to compile (GCC 5.1.1 with pedantic says ISO C doesn't allow predefined __FUNCTION__ and the manual suggests the change made). Permissions on /dev/dahdi and /dev/dahdi/* seem to be correct. I moved all the configuration files as needed according to the --prefix changes made. I cannot find anything online about this. I may just be searching for the wrong terms. Anyone know how to fix this at this time? I would greatly appreciate any help as I have been away from the computing world for a few months. Trever