This is usually given by the router when none of the other codes apply. This cause usually occurs in the same type of situations as cause 1, cause 88, and cause 100.
403
Forbidden
outgoing calls barred
This cause indicates that although the calling party is a member of the CUG for the outgoing CUG call, outgoing calls are not allowed for this member of the CUG.
404
Not Found
Unallocated (unassigned) number [Q.850 value 1]
This cause indicates that the called party cannot be reached because, although the called party number is in a valid format, it is not currently allocated (assigned).
484
Address Incompplete
invalid number format (address incomplete) [Q.850]
This cause indicates that the called party cannot be reached because the called party number is not in a valid format or is not complete.
486
Busy Here
user busy [Q.850]
This cause is used to indicate that the called party is unable to accept another call because the user busy condition has been encountered. This cause value may be generated by the called user or by the network. In the case of user determined user busy it is noted that the user equipment is compatible with the call.
487
Request Terminated
This indicates that the person who made the incoming calls dropped it before the call was answered.
This indicates that the person who made the incoming calls dropped it before the call was answered.
500
Server Internal Error
temporary failure
This cause indicates that the network is not functioning correctly and that the condition is not likely to last a long period of time; e.g. the user may wish to try another call attempt almost immediately.
502
Bad Gateway
destination out of order
This cause indicates that the destination indicated by the user cannot be reached because the interface to the destination is not functioning correctly. The term "not functioning correctly" indicates that a signal message was unable to be delivered to the remote party; e.g. a physical layer or data link layer failure at the remote party, or user equipment off-line.
603
Decline
call rejected [Q.850]
This cause indicates that the equipment sending this cause does not wish to accept this call, although it could have accepted the call because the equipment sending this cause is neither busy nor incompatible. The network may also generate this cause, indicating that the call was cleared due to a supplementary service constraint. The diagnostic field may contain additional information about the supplementary service and reason for rejection.
