i have noise in cisco ip phone 7985

hello everybody
i am sorry about my language
i have noise in cisco ip phone when manager connecte to secretary only
and when i restart ip phone the problem solved but after one week return same problem
what is the solution
thank you
i am sorry about my language

i have noise in cisco ip phone when manager connecte to secretary only
and when i restart ip phone the problem solved but after one week return same problem
what is the solution
thank you