10-14-2013 11:55 AM - edited 03-16-2019 07:53 PM
voice service voip
sip
silent discard-untrusted
Silent discard was added in 15.3.3M to make the router not send 403 errors to untrusted entities...which exposes the router (validates that it's there essentially).
Might want to add that when upgrading to that version.
Tracy