I have 2 sip peers 100 and 101 registered on asterisk 1.0.7. When i.e. 101 is busy or has DND activated and 100 dial 101, 101 return the sip code 486 (it is ok) to asterisk, but asterisk sends sip code 403 to 100. So the caller sees that calee is not busy but forbidden. With a newer version (1.2.24) it is ok. Unfortunatelly I can't now upgrade this 1.0.7 asterisk because of large dialplan and other causes. It is some bug or config problem? I hope there is some easy solution (patch?) for that problem. Thank's for every idea.