I have 4 7941's that all have the same issue. They have previously been working ok, but when I unplug then replug them into the PoE the Headset and Mute lights are constantly lit, and the line lights flash green one after another. The Cisco boot logo does not come up.
I tried a factory reset, but it won't do that either.
Does anyone have any ideas? As the phones are only a couple of months old, Cisco simply RMA'd them, but I want to know why this is happening.
Check the speed settings on the switch. I had a problem with a 3750 a little while ago. It seemed that all the switchports were set to speed 1000. This caused my IP phones problems because they weren't -GE models. I resolved the problem by setting the ports to speed 100.
Thanks everyone that replied. After working with TAC and our MPLS provider (Global Crossing) it turns out the latency on the network from the Glasgow site to the US site where the TFTP server lives is on the verge of being unacceptable.
We are working with GC to tune the Glasgow WAN link. In the meantime, plugging in the phones at one of our other sites that has a acceptable ping response time fixes the phones.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
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CUCM Database Replication is an area in which Cisco customers and
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