Hi, Again I was struck in a problem, Here is the scenario. On incomming call, I just call an event outboud socket. But what happens is, for the first 15 call, it is working fine. But from the 16th call to 30th call, it says the below error. 2009-10-07 15:07:48.201846 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:17 (ignored) 2009-10-07 15:07:55.381861 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:18 (ignored) 2009-10-07 15:07:58.569774 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:19 (ignored) 2009-10-07 15:08:01.37824 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:20 (ignored) 2009-10-07 15:08:03.129846 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:21 (ignored) 2009-10-07 15:08:04.825851 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:22 (ignored) 2009-10-07 15:08:06.289977 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:23 (ignored) 2009-10-07 15:08:07.761961 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:24 (ignored) 2009-10-07 15:08:09.737944 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:25 (ignored) 2009-10-07 15:08:11.462018 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:26 (ignored) 2009-10-07 15:08:13.566024 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:27 (ignored) 2009-10-07 15:08:15.430163 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:28 (ignored) 2009-10-07 15:08:17.446103 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:29 (ignored) 2009-10-07 15:08:19.430118 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:30 (ignored) 2009-10-07 15:08:21.358121 [WARNING] ozmod_libpri.c:761 --Failure opening channel 1:31 (ignored) But for the next call, when it is opening channel 1:1, it is executing my dial plans. I don't know why it failed when it is choosing 1:17-1:31. Any one has any idea. Below are my configuration details: openzap.conf [span zt PRI_1] trunk_type => e1 b-channel => 1:1-15 d-channel=> 1:16 b-channel => 1:17-31 openzap.conf.xml <configuration name="openzap.conf" description="OpenZAP Configuration"> <settings> <param name="debug" value="7"/> </settings> <libpri_spans> <span name="PRI_1"> <param name="node" value="cpe"/> <param name="switch" value="euroisdn"/> <param name="dialplan" value="XML"/> <param name="context" value="default"/> </span> </libpri_spans> </configuration> zaptel.conf span=1,1,0,ccs,hdb3 bchan=1-15,17-31 dchan=16 loadzone = us defaultzone = us oz list span: 1 (PRI_1) type: isdn chan_count: 47 dialplan: XML context: default dial_regex: fail_dial_regex: hold_music: analog_options none