the error messge on the IP phone "the call has been restricted"
1-Make sure that the IP phone is not activating the Voice mail feature.
2-Make sure that the IP phone is not forwarded to another number.
3- if the problem still exists ,kindly try the following commands.
config delete subscriber dn 6072
config delete sipue eid 6072
config add sipue eid 6072 authorizationtype noauth
config add subscriber eid 6072 dn 6072
and set your IP phone account to be without password only for the test after that you can return it back again.
3-Make sure that the calling IP phone had the right to call the 6072 be checking the local calls field.
1-configuring the un-conditional voice mail on the IP phone by mistake and The u1930 didn't have a voice mail license
2-The voice mail license users is finished.