I have asterisk 1.2.18 Each my extention number has a mailbox; I have SIP extentions and IAX extentions. When I call an unregister extention number (SIP/IAX) from SIP hard/soft-phone, asterisk actives the voicemail (I can put a message in the mailbox). Instead when I call an unregister extention number (SIP/IAX) from IAX hard/soft-phone I get an immediate hangup. Can you help me thank Andrea