On a number of occasions using openzap with libpri the D channel seems to some how lose synchronisation resulting in 'D-READ FAIL! []'. Background: ----------- On one side is a very standard Linux box with Freeswitch and a TE110p card. The signalling is set up to be a Network E1. On the other side of the PRI coax cable is a box I am experimenting with has openzap interacting with a small application of my own. This side is set up to be a CPE E1 (using a TE210p). This problem has happened to me previously using freeswtich/openzap but scouring the internet has found nought. I am concerned that I have done something silly, but I have double checked everything. The error is printed from lpwrap_pri.c line 117. Symptoms: --------- On freeswitch "D-READ FAIL! []" is just printed to screen over and over again. After issuing a shutdown the following clue is given after stopping mod_openzap: 2009-07-22 17:11:07 [INFO] zap_io.c:257 zap_channel_destroy() Closing channel zt:1:30 fd:67 2009-07-22 17:11:07 [INFO] zap_io.c:257 zap_channel_destroy() Closing channel zt:1:31 fd:68 D-READ FAIL! [] Error = -1 Lpwrap Run Pri: : Bad file descriptor On Openzap (without freeswitch) the following happens: [CRIT] src/ozmod/ozmod_libpri/lpwrap_pri.c:122 __pri_lpwrap_read() span 5 D-READ FAIL! [] [ERROR] src/ozmod/ozmod_libpri/ozmod_libpri.c:88 s_pri_error() !! Received short I-frame (expected 4, got -3) [DEBUG] src/ozmod/ozmod_libpri/ozmod_libpri.c:812 process_event() EVENT [ALARM_TRAP][7][5:1] STATE [PROGRESS_MEDIA] [DEBUG] src/ozmod/ozmod_libpri/ozmod_libpri.c:821 process_event() Changing state on 5:1 from PROGRESS_MEDIA to RESTART [WARNING] src/ozmod/ozmod_libpri/ozmod_libpri.c:831 process_event() channel 5:1 (1:1) has alarms! [YELLOW/LOOP] [DEBUG] src/ozmod/ozmod_libpri/ozmod_libpri.c:812 process_event() EVENT [ALARM_TRAP][7][5:2] STATE [DOWN] ...The last two are printed repeatedly. For some extra information I have summarised my setup below. Any help on this (surly I am not the first person to experience this!) is greatly appreciated. Many thanks, -alex Setup: ------ *Zaptel.conf* Box1 (Freeswitch Network E1) has 'span=1,1,0,ccs,hdb3' Box2 (Openzap CPE E1) has 'span=1,0,0,ccs,hdb3' I have experimented with crc4 on/off and timing of 1/2. *openzap.conf* similar on both sides. [span zt] number => 1 trunk_type => e1 b-channel => 1-15,17-31 d-channel=> 16 *openzap.conf.xml* Box1 (Freeswitch Network E1). <libpri_spans> <span id="1"> <param name="node" value="network"/> <param name="switch" value="euroisdn"/> <param name="dialplan" value="XML"/> <param name="context" value="default"/> </span> </libpri_spans> Box2 (Openzap CPE) passes the following to libpri (via zap_configure_span); "node", "cpe", "switch", "euroisdn", "dp", "unknown", "l1", "alaw",