I cannot access the phone using a web browser
Are you using config files loaded from the server? If so, make certain they are properly configured. Also, make certain the phone does not already have an alternate configuration in it that points elsewhere...
SOURCE: I have 13 soundpoint ip 501 phones
R U USING XLITE OR ARE YOU USING ANY ASTRISK SEREVER... IT IS VERY EASY JUST GIVE ME THE INFORMATION..
SOURCE: Polycom Soundpoint IP 501 - URL call is disabled
This in it's most basic description means that the phone is unable to register with the SIP server, most likely for lack of internet connectivity or a firewall blocking the packets.
If you've verified connectivity and opened the proper ports and the phone fails to initialize and still getting “URL Call Disabled” or all of the above parameters are correct, update the firmware for the router. This can usually be done within the router configuration. Then reboot in order, the cable modem or DSL, the router or switch, then the phone. This may solve the problem.
If still having the same issue, confirm in the router configuration for settings such as SIP proxy, gateway, or application layer or any configuration setting for SIP or VOIP. If any of these do exist, make sure they are turned off as these may only confuse or adversely affect many implementations.
SOURCE: Making a Polycom SoundPoint 501 work on an Avaya IPO
As you have probably found, SIP phones are not supported until R5, which just came out.
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