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SPA941 rejecting calls

I have an SPA9000 system with SPA9xx phones. One handset is a SPA941, the others are SPA921. All handsets are at firmware 5.1.8.

One of the ITSP providers is Sipgate, and in recent weeks, calls from a number with callerID witheld are rejceted back to the ITSP voicemail, whereas calls which present callerID are allowed through.

There is no block via Sipgate and they have investigated the SIP response at their end which is "486 Busy Here".

I have rebooted, power cycled and reloaded the firmware and none of these make a difference. Internal transfers to this handset and external calls from another trunk routed via AA all work fine.

However by directing the Sipgate calls to an SPA921 handset, it works without a hitch.

Is there anything known about the firmware or configuration for the SPA941 that I should look for, or is it possible this is a hardware fault?

Many thanks for any responses.

Pete

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