Hi, a customer of ours is running a CS1000E on a nortel data network. The problem they experiencing is some of the IP phones intermittently freezes up and loose connectivity to the CS1000. To resolve this issue you have to reboot the phone which solves the problem for a few minutes When i test the phone on a different CS1000 it seems to be stable without freezing up. Could this be a firmware issue on the phone or the signalling server or maybe a port setting on the 5520 data switches?
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1120/1140 IP phones reset/freezes
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ThephoneDude
Vendor
I have seen this when the PD/redial feature is programmed wrong. When configuring the server you must use the ELAN ip address of the signaling server that will be running the PD feature.
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I would say some sort of port/data setting on your 5520. Does your IP route go through different switches/gateways when you set up the freezing phone on your other CS1000? My guess would be yes of course - but you never know these days 
Could be losing heartbeat or some other critical packet. BEST RECOMMENDATION - setup a sniffer on the ELAN and start looking at packets. Good luck.
Could be losing heartbeat or some other critical packet. BEST RECOMMENDATION - setup a sniffer on the ELAN and start looking at packets. Good luck.
DavidSigma
IS-IT--Management
If you are using POE try to connect the 11xx with a 48V PSU sometimes it helps.
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DavidSigma
IS-IT--Management
No problem. The phone will decide from which source to work.
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