Hello. If I receive a Phone call by ISDN or from SIP Provider, the Asterisk make some errors and the SIP Client don't react. The messages from Asterisk in verbose mode: er will net. Asterisk messages in Terminalmode: parse_srv: SRV mapped to host sip-ha.web.de, port 5060 Mar 10 00:02:17 NOTICE[5776]: chan_sip.c:7191 handle_request: Failed to authenticate user "unknown" <sip:unkown@web.de>;tag=as5bfdabe6 Mar 10 00:02:17 NOTICE[5776]: chan_sip.c:7191 handle_request: Failed to authenticate user "unknown" <sip:unkown@web.de>;tag=as76a8acb1 Mar 10 00:02:17 NOTICE[5776]: chan_sip.c:7191 handle_request: Failed to authenticate user "unknown" <sip:unkown@web.de>;tag=as29a2f623 Mar 10 00:02:18 NOTICE[5776]: chan_sip.c:7191 handle_request: Failed to authenticate user "unknown" <sip:unkown@web.de>;tag=as44aed266 -- parse_srv: SRV mapped to host sip-ha.web.de, port 5060 -- creating pipe for PLCI=0x101 msn = 456456 -- started pbx on channel (callgroup=0)! == Starting CAPI[contr1/456456]/3 at ,5480080,1 failed so falling back to exten 's' == Starting CAPI[contr1/456456]/3 at ,s,1 still failed so falling back to context 'default' Mar 10 00:04:42 WARNING[5776]: pbx.c:1882 ast_pbx_run: Channel 'CAPI[contr1/456456]/3' sent into invalid extension 's' in context 'default', but no invalid handler -- Executing Hangup("CAPI[contr1/456456]/3", "") in new stack == Spawn extension (default, h, 1) exited non-zero on 'CAPI[contr1/456456/3' -- CAPI Hangingup -- removed pipe for PLCI = 0x101 Here is my sip.conf: [general] bindaddr = 0.0.0.0 port = 5060 context = default maxexpirey = 3600 defaultexpirey = 120 srvlookup = yes tos = 0x18 disallow = all allow = gsm allow = alaw allow = ulaw allow = g729 register => christoph:passwd@sip.web.de/christoph.hehl [web_de] context = default type = friend host = sip.web.de username = christoph secret = password fromuser = christoph fromdomain = sip.web.de dtmfmode = inband nat = yes insecure = no [chris] type = friend secret = passwd host = dynamic dtmfmode = rfc2833 nat = no callerid = "chris" <11> canreinvite = no qualify = no insecure = very my extensions.conf static = yes writeprotect = no [globals] [default] exten => h,1,Hangup exten => 11,1,Dial(SIP/chris,,tr) exten => 11,2,Hangup exten => 456456,1,Dial(11,,tr) exten => 456456,2,Hangup exten => _0.,1,Dial(SIP/${EXTEN:1}@web_de,,tr) exten => _0.,2,Hangup exten => _1.,1,Dial(CAPI/@456456:${EXTEN:1},,tr) exten => _1.,2,Hangup Please Help