[Asterisk-Users] Problems receiving SIP calls

[Simon Brown]

I can't see for the trees :)

I can make calls out to my SIP provider but get an "unable to authenticate
<calling no.> when I try to call in via the PSTN number they have supplied me
(where <calling no.> = phone number trying to make the call)

sip.conf
[general]
register => 4316568:xxxxxxxx at sipgate.de
[sipgate]
secret=xxxxxx
username=4316568
fromuser=4316568
fromdomain=sipgate.de
type=friend
host=sipgate.de
dtmfmode=rfc2833
canreinvite=no
nat=no
context=from-sip

extensions.conf
[from-sip]
exten => 4316568,1,SetCallerID(${CALLERIDNUM})
exten => 4316568,2,SetCIDName(${CALLERIDNAME})
exten => 4316568,3,Goto(mainmenu,s,1)
exten => 4316568,4,Hangup

TIA 

Simon Brown