Call Leg Media Quality Report report show high packet loss

Any idea to fix the high packet loss issue?

User didn't report the call have problem but Monitor server show it have packet loss, only inbound show have high packet loss.

Thanks.

Caller : PSTN call

Callee: Lync User

Audio Stream (Caller -> Callee)
    Codec: PCMA Sample rate: 8000
    Packet utilization: 2336        
    Avg. packet loss rate: 45.16 % Max. packet loss rate: 95.22 %
    Avg. jitter: 0 ms Max. jitter: 0 ms
    Burst duration: 0 ms Burst gap duration: 45400 ms
    Burst density: 0.00 % Burst gap density: 0.00 %
    Avg. concealed samples ratio: 31.00 % Avg. stretched samples ratio: 0.00 %
    Avg. compressed samples ratio: 0.00 %        
    Avg. network MOS: 3.73 Min. network MOS: 3.73
    Avg. network MOS degradation: 0.00 Max. network MOS degradation: 0.00
    NMOS degradation (jitter): 0.00 % NMOS degradation (packet loss): 0.00 %

May 11th, 2015 12:47am
This is weird. Does this call is going to any mobile devices ?. What do you see on your network devices logs. If this is the packet loss, user can not experience good call quality.
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May 11th, 2015 2:55am

Hi Jo,

please describe network between caller and callee.

Are they on same network,wifi,mobile,Direct Access or VPN?

May 11th, 2015 2:58am
Caller is T1 to gateway sip to Mediation server. Only inbound T1 have this issue. Callee is Lync user. They using Lync desk phone.
  • Edited by Jo Tse 22 hours 5 minutes ago desk
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May 11th, 2015 5:16am
From user activity showed outbound and inbound call is normal. Is it the packet loss is between mediation server and Gateway? Mediaby pass is enabled. Ping from mediation server to gateway is normal. No timeout .
May 11th, 2015 5:19am
Caller is T1 to gateway sip to Mediation server. Only inbound T1 have this issue. Callee is Lync user. They using Lync desk phone.
  • Edited by Jo Tse Monday, May 11, 2015 9:19 AM desk
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May 11th, 2015 9:14am
Caller is T1 to gateway sip to Mediation server. Only inbound T1 have this issue. Callee is Lync user. They using Lync desk phone.
  • Edited by Jo Tse Monday, May 11, 2015 9:19 AM desk
May 11th, 2015 9:14am
Caller is T1 to gateway sip to Mediation server. Only inbound T1 have this issue. Callee is Lync user. They using Lync desk phone.
  • Edited by Jo Tse Monday, May 11, 2015 9:19 AM desk
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May 11th, 2015 9:14am

Hi,

Please also check the Monitoring Reports to check the audio quality. Such as the Media Quality Summary Report and the Location Report.

Audio quality issues may cause by the network. Network problems typically affect groups of users in a particular location. The Location Report provides a list or network locations identified by the caller subnet ranked by highest percentage of poor call quality.

More details:

http://blog.insidelync.com/2012/06/a-primer-on-lync-audio-quality-metrics/

Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.

Best Regards,
Eason Huang

May 12th, 2015 4:32am

Hi,

They is asking why the report showed the have packet loss and the voice quality is bad.

No user report they have experience bad voice quality. It is very weird.

They monitor eight SBAs with Gateway and running same version Lync 2010.

Only one SBA monitor report have this issue. They want to improve the call quality if there have problem.

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May 12th, 2015 9:41am

Can you clarify if the loss is observed on others located on the same subnet as this user. Also asked, is whether you have looked at the location report on Lync. If this is happening only to one user then you might want to change the users phone or pc and monitor.

You can alternatively do continuous ping and find out.

May 12th, 2015 10:00am

Can you clarify if the loss is observed on others located on the same subnet as this user. Also asked, is whether you have looked at the location report on Lync. If this is happening only to one user then you might want to change the users phone or pc and monitor.

You can alternatively do continuous ping and fin

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May 12th, 2015 10:41am

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