i have setup a Astersk box and set allowguest=yes to allow calls from anyone and anywhere. for good measure i added insecure=invite.
when i call from a xten on my pc all works great. however if i route the call via another asterisk box i get
chan_sip.c:16048 handle_response_invite: Failed to authenticate on INVITE to ‘12127773456’
why would asterisk to asterisk behave differently and how can i solve this problem ?