41 temporary failure

Cause No. 41 - temporary failure.

This cause indicates that the network is not functioning correctly and that the condition is no likely to last a long period of time; e.g., the user may wish to try another call attempt almost immediately.

Hangup Cause 41 means that your Terminator is refusing your calls.

Wrong number format

Maybe you are sending it in a format that is not acceptable to the Terminator? Maybe he needs +, 00, or something else in front of the number?