Instead of setting these phones up by hand they should ALL be setup via files on the the FTP server.
At the end of the day, an administrator really shouldn't even have to even touch the phone other than setting up the FTP server, login and password.
When it powers on, it will give you a menu for a few seconds. Otherwise, change it to Disabled and put in the IP/subnet mask/DNS/domain name/gateway info manually.
I've seen mention elsewhere of having to put in special stuff for Polycom phones, but I've not had to do it with the firmware I'm using.
These SIP extension setup instructions are pretty standard: In extensions.conf, add a SIP extension as normal.
Please see: Handbook Wiki Chapter 7 and read the Polycom phones section.
It REALLY goes in depth concerning all the files you're dealing with and also how to provision.
Asterisk Bulk Provisioning Polycom Phones tutorial Set up and start up your TFTP server and make sure the files from the Boot ROM and the SIP archives are un ZIPped and in the root TFTP directory.
By default, the root TFTP directory is tftpboot, but this may be different on your machine if someone has changed it.Overall, I might recommend them over the GXP-2000's at this point for professional installations, but with some firmware updates from Grandstream, they may be more evenly matched in the future.Proceeding to the configuration: these instructions were made with Asterisk 1.0.9, Polycom Boot ROM 2.6.2 and SIP software version 1.5.2.At time of this writing, Grandstream GXP-2000's are around 5, and Polycom 501's are around 0.The Polycom 501's do have more and easier-to-get-to functionality than the GXP-2000's, and have a more professional look and feel (and a great speakerphone), but the most notable downsides of the 501 are its awful, obtuse and slow configuration interfaces.The relevant options for Asterisk configuration are buried fairly deep on the console, and the big problem with the web interface is that it takes at least an extra minute to become available even AFTER the phone is up and running.