I do not know what has caused this, I was unaware that it was the case: When I register to pbxes.org it resolves to 188.40.65.170 (www1.pbxes.com). When I dialout from a pbxes extension to an extension on my local FreePBX, it comes from 88.198.69.250 (www3.pbxes.com) and that is refused with a: Failed to authenticate device "home office" <sip:210@88.198.69.250:27658>;tag=as7fcc54f9 This also occurs if an inbound call on a pbxes trunk is directed to my FreePBX. Is this new behaviour? if so, is there a solution? your help is appreciated.