503 returned for one of two lines on OBI202

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Gavo:
Hello,

I have an OBI202 working in a windfarm substation in a remote location. It has been fine for the past 5 years. However last week one of the two lines registered on it (both from same provider) started rejecting inbound calls with a SIP 503 message.

Both lines are fine for outbound.

Has anyone seen this before ? Any ideas how to troubleshoot ? The provider simply says that the endpoint is rejecting the call.

Thanks in advance.

Gavin

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