Hello, I installed a Sangoma A108 with openzap and libpri. Signalling (E1) works sometimes (inbound and outbound calls are connected) but not always. Sound is just distortion but connection is stable. 2 questions: 1) What is the best way to go with Sangoma? OpenZAP with libpri or without libpri? (I remember there are some timer problems in openzap when not using libpri but this might have changed) However Sangoma recommends OpenZAP on their wiki. 2) What might cause the distortion? I crosschecked the config files and had a look at the interrupts (<2k/sec). Seems to be ok. ACPI and APIC is turned on. Freeswitch starts successfully with all the channels enabled. "oz dump" shows D-Channel up. "oz libpri debug 1 all" shows debugging messages with no special warnings. Best regards Peter Some confs for 1 Channel: Wanpipe1.conf [devices] wanpipe1 = WAN_AFT_TE1, Comment [interfaces] w1g1 = wanpipe1, , TDM_VOICE_API, Comment [wanpipe1] CARD_TYPE = AFT S514CPU = A CommPort = PRI AUTO_PCISLOT = NO PCISLOT = 4 PCIBUS = 11 FE_MEDIA = E1 FE_LCODE = HDB3 FE_FRAME = CRC4 FE_LINE = 1 TE_CLOCK = NORMAL TE_REF_CLOCK = 0 TE_SIG_MODE = CCS TE_HIGHIMPEDANCE = NO LBO = 120OH FE_TXTRISTATE = NO MTU = 1500 UDPPORT = 9000 TTL = 255 IGNORE_FRONT_END = NO TDMV_SPAN = 1 TDMV_DCHAN = 16 TDMV_HW_DTMF = YES TDMV_HW_FAX_DETECT = YES [w1g1] ACTIVE_CH = ALL TDMV_HWEC = YES MTU = 80 openzap.conf [span wanpipe PRI_1] name => OpenZAP number => 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="1"/> <param name="hold-music" value="$${moh_uri}"/> <!--<param name="enable-analog-option" value="call-swap"/>--> <!--<param name="enable-analog-option" value="3-way"/>--> </settings> <libpri_spans> <span id="1" name="PRI_1"> <param name="node" value="cpe"/> <param name="switch" value="euroisdn"/> <param name="dialplan" value="XML"/> <param name="context" value="default"/> <param name="q921loglevel" value="debug"/> <param name="q931loglevel" value="debug"/> <param name="dialect" value="q931"/> <param name="l1" value="alaw"/> </span> </libpri_spans> </configuration>