I just upgraded from Asterisk 1.4 (which worked with the same dialplan) to Asterisk 1.6.0. Since then incoming calls from my voip.provider are “rejected because extension not found”.
sip.conf: [sipgate] type=friend secret=password insecure=invite username=556677 defaultuser=556677 fromuser=556677 context=sipgate_in fromdomain=sipgate.de host=sipgate.de outboundproxy=proxy.live.sipgate.de qualify=yes dtmfmode=rfc2833
exten => _X.,1,Dial(SIP/125,16)
exten => _X.,n,Voicemail(125)[/code]
== Using SIP RTP CoS mark 5
[Jun 6 10:40:03] NOTICE: chan_sip.c:16869 handle_request_invite: Call from '' to extension '556677' rejected because extension not found.