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AMA-CUCM Troubleshooting: Best Practices for Reading Trace Files

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Robotic Voice one Cisco IP Phone 7911

It has a client that is bothering me a lot because of a 7911 that with robotic voice, already explained to him that it is a network problem, he gave a ping on the phone and identified that is dropping packets, but still want a document to speak that someone has a document like this?

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Accepted Solutions
Cisco Employee

Hi Geovane,

Hi Geovane,

As per the following

http://www.cisco.com/c/en/us/support/docs/voice/voice-quality/20371-troubleshoot-qos-voice.html#topic1

"

Causes of Choppy Voice

Choppy voice quality is caused by voice packets being either variably delayed or lost in the network. When a voice packet is delayed in reaching its destination, the destination gateway has a loss of real-time information. In this event, the destination gateway must predict what the content of the missed packet can possibly be. The prediction leads to the received voice not having the same characteristics as the transmitted voice. This leads to a received voice that sounds robotic. If a voice packet is delayed beyond the prediction capability of a receiving gateway, the gateway leaves the real-time gap empty. With nothing to fill up that gap at the receiving end, part of the transmitted speech is lost. This results in choppy voice. Many of the choppy voice issues are resolved by making sure that the voice packets are not very delayed (and more than that, not variably delayed). Sometimes, voice activity detection (VAD) adds front-end clipping to a voice conversation. This is another cause of choppy (or clipped) voice.

The various sections in this document show how to minimize the instance of choppy voice. Most of these measures require assuring the introduction of minimum jitter in your voice network."

Manish

2 REPLIES 2
Cisco Employee

Hi Geovane,

Hi Geovane,

As per the following

http://www.cisco.com/c/en/us/support/docs/voice/voice-quality/20371-troubleshoot-qos-voice.html#topic1

"

Causes of Choppy Voice

Choppy voice quality is caused by voice packets being either variably delayed or lost in the network. When a voice packet is delayed in reaching its destination, the destination gateway has a loss of real-time information. In this event, the destination gateway must predict what the content of the missed packet can possibly be. The prediction leads to the received voice not having the same characteristics as the transmitted voice. This leads to a received voice that sounds robotic. If a voice packet is delayed beyond the prediction capability of a receiving gateway, the gateway leaves the real-time gap empty. With nothing to fill up that gap at the receiving end, part of the transmitted speech is lost. This results in choppy voice. Many of the choppy voice issues are resolved by making sure that the voice packets are not very delayed (and more than that, not variably delayed). Sometimes, voice activity detection (VAD) adds front-end clipping to a voice conversation. This is another cause of choppy (or clipped) voice.

The various sections in this document show how to minimize the instance of choppy voice. Most of these measures require assuring the introduction of minimum jitter in your voice network."

Manish

Highlighted

Hello Manish,

Hello Manish,


Thank you very much for your help, this will serve much to me.

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