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Community Member

Voice Quality Issues

Hi,

We have a ip telephony setup running with ccm 4.1(3). Calls made to/from one of the branch is have voice quality issue. it comes quite often. whenever there is a voice quality issue the Rx loss parameter in the ip phone is increasing rapidly. Appropriate voice bandwidth has been allocated in the qos configuration. During the issue the link utlizaiton is at its peak.

Please let me know to solve this.

Krishna.

2 REPLIES
Hall of Fame Super Silver

Re: Voice Quality Issues

Does not seem like your QoS is configured completely. What is the link, and what's the speed?

Is voice traffic marked accordingly, run "sh policy-map interface serial x/x" commaand on your egress WAN router and see if the LLQ policy-map is matched coorectly.

One thing I see misconfigured a lot is on the switchports connected to router peoaple put in "mls qos trust cos" it needs to be"mls qos trust dscp".

Chris

Community Member

Re: Voice Quality Issues

A few questions:

How big is the link?

What type of link is it?

How many calls do you typically have up on the link under high utilization?

What codec are you using?

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