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We have successfully repaired thousands of Cisco IP phones, listed below are some of the faults we deal with on a daily basis.
Faulty LAN port
Failure to boot up after power cycle
LCD display is damaged or faulty
LCD is blank and the speakerphone lamp stays green
Poor audio quality on handset microphone
Software update failure
Unable to hear through receiver or speaker
Unable to make or receive calls
June 2015 – Some of our customers have recently experienced a number of faults due to components degrading as the phone ages.
Further information on this issue has been supplied by Cisco – Memory component issue