I got "Couldn't contact DHCP" error on my one Polycom SoundPoint IP 320. And, when I disabled the DHCP feature and set static IP address, the phone worked normally. While the other phone, can contact the DHCP server and get IP address.
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This means that your phone will not dial a url number, i.e. sip://email@example.com. This is generally a network or configuration error, and I would specifically make sure the phone either has static DNS entries entered or is receiving DNS entries via DHCP.
sounds like your belkin router is not setup as a DHCP server or the DHCP is disabled. The DHCP in the belkin assigns addresses to the internal network, the error "waiting for network to initialize" means that the phone is waiting for an IP address, to which its not getting. When you connect directly to your modem you get an IP from your Internet service provider. I'll bet your internal network is setup using "static" ip addresses, if thats the case you will need to surf into the phones web console and set a static IP address. Or the opposite, enable DHCP in the belkin.
hope that clarifies things a little.
try to turn off the Polycom device. When you turn it back on, press Setup. from the options, select server then click edit. Then select the item Trivial FTP (that setup depends on your ISP), and type the IP address assigned to your network (example 192.168.90.90) then hit OK. click exit several times then press Save & reboot. If it did not work, let us know...
Default Passwords: To get into the web interface, the default username/password is "Polycom"/"456" (Note that this does not work with Safari 1.2.2.) To get into the Admin interface on the hard phone, the password is "456". (Prior to v1.3.1, the web interfaces to the phone uses "Polycom"/"SpIp" as the username/password.) The "user password" (not used much) defaults to "123".
To reset a lost admin password to default: at phone boot, during the 5 second countdown, push/hold 468* on the phone. Enter the phone's MAC address as the password. This will reset network info but keep peers loaded. Tested on Soundpoint IP 650.
Due to the age of the SoundPoint Pro, it some of its features are not compatible with newer phonesystems, such as CableVision. There are no software updates for the SoundPoint Pro, and as long as the Caller ID is enabled there are no other settings or adjustments that can be made to workaround these kind of problems unfortunately. I recommend contacting your service provider to see what kind of caller ID signaling they are using; most likely they will be using a newer digital system, or MDMF which is not backwards compatible with SDMF or earlier CID receivers.
Make sure you have the latest BootROM and SIP config files for this
polycom(sip.ld, sip.cfg, etc...) on your TFTP server. If you do not
have this - download from here - http://www.polycom.com/support/voice/soundpoint_ip/soundpoint_ip501.html
If you do not have a TFTP server, you can download one for free.
This means the phone's SIP application has been erased. You will need
to download the SIP app and BootROM from the Polycom support page, host
the files on a boot server, and then point the phone to this server
from the server menu so the phone will reboot and download the files.
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.