The number you dialed is not in service please check your number and try again

Hello
I have a SIP TRUNK Cshmtksrim sometimes hear this message:
The number you dialed is not in service please check your number and try again
Sometimes everything is fine
I do not know what the problem
Thanks
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You would need to post your trunk configs and error logs
You haven't posted enough information for us to respond.
Eugene Blanchard
Author of PBX in a Flash for Newbies and Introduction to Data Communications