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503 Error


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every now and then we receive the following error:


Trunk "XYZ" changed to "503 Server Too Busy" (Registration failed, retry after 60 seconds). This is a notification email. Do not reply.


I am confused with this error, is this an http or a SIP error. In the manual 503 is refereed to as "service unavailable". If we check when this happens the trunk is clearly not registered, it usually registers on the next attempt but it still presents problems. How can we prevent this from happening?



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