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UC560 phones freezing

Level 1
Level 1


I have a UC560 and it has 41 IP Phones connected. There is a mix of SPA502G, SPA525G2, 7921 and 7975.

There  is an issue that IP Phones are randomly freezing up and disconnecting  etc. and the only way to fix it is to reboot the IP Phone, which isn't a  long term solution. It can happen randomly and anytime.

Some IP  Phones are PoE on a Cisco Catalyst 2960S and some are using AC adapters  connected to other switches. All phones are setup with static IP  addresses and are on the main data VLAN (we cannot run separate VLANs  unfortunately).

Can anyone help shed some light on what could be causing this and or how to fix it?



2 Replies 2

Tommer Catlin
VIP Alumni
VIP Alumni

Can you check to see which Firmware is running on the phones and also what firmware/IOS is on the UC560?   Its probably not the switches, but some sort of SCCP communication between the 560 and phones.  Do you notice any issues on the UC560 such as high memory or CPU usage?

The UC560 is running the latest firmware and the SPA phones are running the latest loads from that firmware.

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