Hi, I have installed freeswitch through SVN in centos.OutBound is working fine .But not always .Once we make 8 to 10 call from a sip extension we get service unavailable error in xlite . Error and configuration are pasted below .we observed the problem is getting rectified after 5 to 10 mins .and we are able to make calls and again after 8 to 10 calls Errors happen how to check. what will be the issue my configuration is: *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 = 9 PCIBUS = 0 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 = NO [w1g1] ACTIVE_CH = ALL TDMV_ECHO_OFF = NO TDMV_HWEC = YES MTU = 80 * openzap.conf* [span wanpipe] 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="0"/> </settings> <pri_spans> <span id="1"> <param name="mode" value="user"/> <param name="dialect" value="euro"/> <param name="dialplan" value="XML"/> <param name="context" value="default"/> </span> </pri_spans> </configuration> *default.xml* <?xml version="1.0" encoding="utf-8"?> <!-- http://wiki.freeswitch.org/wiki/Dialplan_XML --> <include> <context name="default"> <extension name="Long Distance - wanpipe"> <condition field="destination_number" expression="^9(\d{5,15})$"> <action application="set" data="dialed_ext=$1"/> <action application="bridge" data="OpenZAP/1/a/${dialed_ext}"/> </condition> </extension> </context> </include> After starting the freeswitch . In console i type oz dump 1 a *my status before calling is:* span_id: 1 chan_id: 16 physical_span_id: 1 physical_chan_id: 16 type: DQ921 state: UP last_state: DOWN cid_date: cid_name: cid_num: ani: aniII: dnis: rdnis: cause: NONE * my (oz dump 1 a) status After calling is:* span_id: 1 chan_id: 16 physical_span_id: 1 physical_chan_id: 16 type: DQ921 state: UP last_state: DOWN cid_date: cid_name: cid_num: ani: aniII: dnis: rdnis: cause: NONE But while i try to make a outbound call continously, i am getting following error [08 02 00 00 4e 18 03 a1 83 81 79 01 80] 2008-09-23 01:05:50 [DEBUG] Span:0 Q.931() Sending message to Layer4 (size: 119) 2008-09-23 01:05:50 [DEBUG] ozmod_isdn.c:319 zap_isdn_931_34() Yay I got an event! Type:[46] Size:[119] CRV: 0 (0, CTX: Originator) 2008-09-23 01:05:50 [DEBUG] ozmod_isdn.c:351 zap_isdn_931_34() zchan 0 (-1:-1) source isdn_data->channels_remote_crv[0] 2008-09-23 01:05:50 [DEBUG] ozmod_isdn.c:399 zap_isdn_931_34() Changing state on 1:1 from DOWN to RESTART 2008-09-23 01:05:50 [DEBUG] Span:0 Q.931() Sending message to Q.921 (size: 119) 2008-09-23 01:05:50 [DEBUG] Span:0 Q.931() Creating Q.931 Message Header: ProtDisc 8 (0x8), CRV 0 (0), CRVflag: 0 (0), MesType: 78 (0x4e) 2008-09-23 01:05:50 [DEBUG] ozmod_isdn.c:1499 q931_rx_32() WRITE 13 -------------------------------------------------------------------------------- [08 02 00 00 4e 18 03 a1 83 81 79 01 80] 2008-09-23 01:05:50 [DEBUG] ozmod_isdn.c:796 state_advance() 1:1 STATE [RESTART] 2008-09-23 01:05:50 [DEBUG] mod_openzap.c:1368 on_clear_channel_signal() got clear channel sig [RESTART] 2008-09-23 01:05:50 [DEBUG] ozmod_isdn.c:882 state_advance() Changing state on 1:1 from RESTART to DOWN 2008-09-23 01:05:50 [DEBUG] ozmod_isdn.c:796 state_advance() 1:1 STATE [DOWN] 2008-09-23 01:05:50 [DEBUG] zap_io.c:1088 zap_channel_done() channel done 1:1 -- Thanks & Regards, Palanivel.S