Hide extension number on a single cisco ip 7965 phone

Hello, we are running a Cisco ISR 2811 with call manager 7.0 for about 12 phones in a very basic configuration. I would like to hide the extension number from the display of one phone. I have a little cisco router/switch knowledge and I have done a trawl but cannot find this particular request addressed elsewhere. The web interface is disabled, so ideally solutions with CLI information please.
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José MéndezCommented:
StephenMorAuthor Commented:
Apologies for inactivity caused due to holidays. I have since discovered that it is not possible to hide the extension number of the phone. I am unsure if the ISR runs CME or CUCM. I will delete the question.

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StephenMorAuthor Commented:
Question was answered elsewhere.
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