Phone : Polycom SIP 331
Firmware : 2345-12365-001.sip.ld
Issue : We have a Linksys E1200 firewall and 6 Polycom SIP 331 phones connected to a D-link DES 1210-28 P Power over Ethernet switch. The phones are set to accept IPs via dhcp. Initially, all the phones got IPs and were communicating with our server fine. Now intermittently, all the phones would loose network inspite of having a private IP from the firewall. Sometimes powercycling the POE switch would resolve the issue. A couple of days ago, power-cycling the POE did not resolve it and after we changed all the IPs on the Polycoms to static IPs, the phone started communicating again. There is nothing else connected to the POE switch besides the firewall and Polycom Phones.
1) Is there a setting on the phones that needs to be adjusted on Polycom Phone to resolve this dhcp issue?
2) Are Polycom phones compatible with brand of POE switch. Has there been issues in the past?
3) Any idea what is causing this?
Thank You for time,
PoE is an industry standard and there would not be tests against individual PoE switches.
The issue you are having leaves a few questions open.
You may want to setup a mapped port so you can run a wireshark trace and check the traffic between the Phone and the Switch.