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Nguyen KeThuc
Beginner

Voice Quality Issue with Cisco IP phone 7821 series

Hi all,

 

I have CUCM 10.5 with Cisco 7821 and 7945 endpoints. Internal calls are fine. However, I get voice quality issue with outbound calls from Cisco 7821 endpoint. The lost packet rate is always about 2 % with just Cisco 7821 series. Meanwhile, I don't get any lost packets with Cisco 7945 endpoints in same outbound calls. My attached files are call statistics of them.

I also try to test by moving the Cisco 7821 the  closest with the voice gateway ( same switch). But, there is still lost packets.

 

Any ideas for me?

 

Thuc

 

5 REPLIES 5
Manish Gogna
Cisco Employee

Hi Thuc,

If you have already tested with the latest firmware of 7821 then you may need PCM capture from the gateway to check which side is causing the issue.

www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/voiceport/configuration/15-mt/vp-15-mt-book/voi-pcm.html#GUID-58294EF2-A10B-4883-AB6C-5C2C30C33509

HTH

Manish

Thanks Manish,

 

Do you doubt lost packet from PSTN side? Follow your link, I will capture the call in my voice gateway. Then what will I do next?

 

Thuc

You can either open a TAC case to get them analyzed or you can try an alternate method described below

http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-system/115749-analyze-pcm-data.html

HTH

Manish

 

Thanks for your advice.

 

Thuc

Did you find a fix for this?

I also have 7821 phones and see similar issues on occasion.

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