Cisco Call Manager 7 configuration assistance

I need to put an IP outside our office space that a visitor can call to let us know they are here, and then we can go to the door and let them in.  I know a intercom and camera would be best for this, but isn't going to happen in the near future.  I've been tasked with setting up an IP Phone outside the door, but this phone cannot dial to the outside world.  I would actually only like this phone to be able to dial for example "2000" which is a hunt group that rings the administrative staff's IP Phones.  I cannot find a way to do this.  First of all, is this possible?  If so, can someone provide me some guidance.  Thanks.
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Ken BooneNetwork ConsultantCommented:
So what a phone is able to call is determined by a combination of the Calling Search Space on the phone and the directory number.

So create a new hunt group in a new partition with "2000"  so its the same number, but it is in a different partition.

Then create a new CSS with only that new partition.

Then assign that CSS to the phone and the phone's DN.  This ensures that is all that can dial.  Of course you might want to consider allowing the phone to reach 911 as well in case there is an emergency in the lobby and they try and fail.

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José MéndezCommented:
Sounds that maybe your are looking for a hotdial, PLAR, or batphone type of configuration:

Basically this will achieve that whenever the handset is picked up, it automatically dials 2000 and someone picks up in the hunt group.
Ken BooneNetwork ConsultantCommented:
Willy you are right on.  If we forgo having the 911 ability in the lobby, then the plar function would fit the need.
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