If you are using WebPro you can not "activate" unregisterd Ip Phones in order for you to see them in every drop down box in the entire system like a MLT Phone which is associated to a actual card therefore the phone doesnt have to be "registered" in order to see it.
ONce a phone is registered to the system you will be able to see that extension in the drop down boxes.
One way to figure out where the next IPPhone will get its "Extension Number" so you can program this into the phone,is to look at all of your physical cards including the Voicemail and look to see what the next port# would be(this is porbably the port your first IP Phone is assigned too) this is where you need to assign an extension number to that port or any port above that, setup your IpPhone to that extension number and presto you have a 2nd IP Phone assigned, meaning its registered but still has to be assigned CAP keys and everything else that goes into setting up a phone.,
now like the guys said Certifications are big deal in the NEC world for the simple fact these things are covered in the training courses, there are several ways to get a IpPhone programed, the above steps are assuming you know your way around the system on a basic level of Programing a 8100 , Ip Phones and Sip Extensions are very simple to setup on a Local Network, provided you have those steps.
This is a easy setup and like they said NO 15-05 programing unless its related to a Phone Offsite and then you really need to know some things, the Phone has to be registered to the system first and then there is a process of setting it up, but if you start messing around with 15-05 and coying around stuff you could hose up that process and have no ip phones working, 90-23 will allow you to ONLY de-register the phone from the system clearing those options out and allowing you to re-register a phone..
