41 temporary failure
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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.
SIP response code 503
Hangup Cause 41 means that your Vendor 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?
Troubleshooting
1. Make sure you are sending calls with the correct number format as requested by Vendor. 2. Check PCAP, sometimes the reason is described in the packet, such as 'Low balance', 'Wrong number', etc 3. Contact your Vendor and ask him why your calls are refused.