Why does my extension return Number Unobtainable when dialled?

Spare/deleted/unconfigured extensions in the system normally return Number Unobtainable (NU) when dialled.

If an extension when dialled returns NU establish whether this is a current valid extension. If so, has it worked OK previously, and is this problem happening to both external (DDi) & internal calls?

If it has never been able to receive incoming calls whatsoever, this could be due to the 'Class of Service' (CoS) associated with this extension. The CoS is a customer revisable aspect of the system. Check that the CoS allows the extension to receive incoming calls.

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