If you have another 7000, login to it and copy the info, then use that to help setup the this phone. If not you can try the following:
Get IP Address: on 7000: Menu > 2 > 2 > 1
Login to web interface: http:\\ip_address
Web: login as admin enter password (default 456)
Web: Simple Setup: SIP Server: enter IP address of server port 5060 SIP Outbound Proxy: use same info
Web: SIP Line Identification: Enter Display Name, Address (something like ext@ip_server Ex: 1234@192.168.1.10), Authentication User ID, Authentication Password, Label
You may also have to update the Digimap: This may help:
https://community.polycom.com/t5/VoIP-SIP-Phones/FAQ-Unable-to-Dial-number-if-Off-Hook-or-on-2nd-Call-in-a/td-p/4233If phone is really messed up you may have to reset to factory defaults and try again:
Factory Reset on Phone: Menu > 3 > 2 > Enter Password > 1 > 5 > 5 > Yes (Phone reboots)
You can also search the polycom site for more information.
Good Luck with everything