We have changed the "from" address used in INVITEs to use the target hostname rather than @voiceless.aa.net.uk so as to be consistent with the REGISTER messages and normal behaviour of SIP handsets. This may help simplify some configurations. We have moved REGISTER process from our test call server (z.voiceless) to our live call servers (a&b.voiceless). INVITE and REGISTER could still come from any of our call servers so please configure to allow the full range of IP addresses. INVITE can still come from a different server to REGISTER.