Voice muffled on Cisco IP phone 7960 phones

[Saravana JSR]

On of my user raised a complaint saying the persons on the other end of calls sounds muffled for almost all calls

He uses cisco IP phone model 7960 phone and its call manager version is 11.5

Kindly help on how to troubleshoot on this issues from scratch.

Regards

Saravana

[George Sotiropoulos]

Do you have other phones in the same VLAN, are all the rest of the users OK? Can you try to replace the device and check if the problem persists?

Can you check if the problem appears on all calls that is, both internal (LAN) and external (Telephony Provider)?

(a) Do you have a problem while calling this phone within the same LAN? Is cabling OK?

(a) Do you have MPLS enviroment between office? Have you implemented CoS?

G

[HARIS_HUSSAIN]

1) Establish the live call and check the call Statistics from the Phone Web Page look for jitter and packet drops.

2) Take packet capture at both ends and check if you see any retransmissions.

3) Check for any firewalls in between and disable any SIP/H323 Inspections.

*** Please rate helpful post; Mark "Accept as a Solution" if applicable

Thanks,
Haris