Hi, I'm trying to configure a few service providers in asterisk. I could configure correctly one only, messagenet.it. I'm trying to register to sipgate and sipphone, with no success (cannot register). I could configure in iax.conf voipbuster and sipdiscount, it registers but it does not allow me to make calls. I'm inside a (departmental) firewall, not sure of the ports that are closed, but I can configure the voip providers in eyebeam without problems. Any suggestions? Here are my configurations files: sip.conf [general] context=default realm=rosario.dcs.shef.ac.uk srvlookup=yes defaultexpirey=480 allow=all ;passwords are changed register => 1234567:aaaaaaa@sip.messagenet.it:5061/1234567 register => 2234567:aaaaaaa@proxy01.sipphone.com/2234567 register => 3234567:aaaaaaa@sipgate.co.uk:5060/3234567 [messagenet] type=peer host=sip.messagenet.it dtmfmode=info username=1234567 secret=aaaaaaa fromuser=1234567 fromdomain=sip.messagenet.it nat=yes authuser=1234567 insecure=very canreinvite=no disallow=all allow=ulaw allow=alaw port=5061 [1001] type=friend username=1001 fromuser=1001 host=dynamic dtmfmode=rfc2833 secret=aaaaaa disallow=all allow=ulaw allow=alaw canreinvite=no iax.conf: [general] allow=all jitterbuffer=no tos=lowdelay register => 1234567:aaaaaaa@iax.voipbuster.com register => 2234567:aaaaaaa@sip.sipdiscount.com [voipbuster] type=peer host=iax.voipbuster.com username= 1234567 secret= aaaaaaa notransfer=yes qualify=no context=internal [sipdiscount] type=peer host=sip.sipdiscount.com username= 2234567 secret= aaaaaaa notransfer=yes qualify=no context=internal extensions.conf: [general] static=yes writeprotect=no [globals] CONSOLE=Console/dsp IAXINFO=guest TRUNKMSD=1 [default] include => incoming include => messagenet-outgoing include => voipbuster-outgoing include => sipdiscount-outgoing [incoming] exten => 1234567,1,Dial(SIP/1001,30,rt) exten => 1234567,2,Dial(SIP/00447723320149@messagenet,30,rt) exten => 1234567,3,Hangup [messagenet-outgoing] exten => _9.,1,Dial(SIP/${EXTEN:1}@messagenet,30,tr) exten => _9.,2,Congestion exten => _9.,3,Busy [voipbuster-outgoing] exten => _8.,1,Dial(IAX2/${EXTEN:1}@voipbuster,30,tr) exten => _8.,2,Congestion exten => _8.,3,Busy [sipdiscount-outgoing] exten => _7.,1,Dial(IAX2/${EXTEN:1}@sipdiscount,30,tr) exten => _7.,2,Congestion exten => _7.,3,Busy