CM 5.2.1: noisy calls on 96xx IP phones inbound and outbound

Doc ID		SOLN300952
Version:		1.0
Status:		Published
Published date:		05 Dec 2016

Author:

Andras Varga

Details

We are facing huge noise on the lines TFN / DID inbound and outbound calls.TRUNK number - 22 ,DS1 board : 34B12 Extension Range : 50209 to 50219
- CM R015x.02.1.016.4
IP phone 9608 with 6.6.2 FW

Problem Clarification

all users in the department is affected, both inbound and outbound calls can hear huge noise/static noise TRUNK number - 22 ,DS1 board : 34B12 Extension Range : 50209 to 50219 .
Int he mentioned extension range the phones have 6.6.2 FW, the rest were on 6.4. Shuffling was turned on, hence the phone did not use the MedPro card.

Cause

too high FW version for the phones.

Solution

downgrade the FW verison to 6.4

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