Call quality problem after 1 year

[MGS Informatique]

We have a installation that after 1 year we are having quality issue, but only to call directed to some cell phone, we can call 3 time and the quality is good and after 3 more call and bad quality.. I have attach a wireshark capture that show that... any ideas?

Attach files
=1&hash=cf678283e5dce5560ed620b63a3f6d1b']

 

[JohnS_3CX]

Hi,

Please do not post captures directly on the forum, they may contain your private information.

Can you be more specific about how you replicate this issue?
Is it only outgoing or incoming calls?
Is it always via the same trunk provider?
How do you make the call? (deskphone/client?)
Is it only when speaking with specific mobile numbers?
What do you mean by bad audio?
Their voice sounds bad or yours?

 

[leejor]

If these are calls placed to the cell phones, and not forwarded calls, and over the same trunks, calls to landlines (not cell phones) don't have an issue, then I'm going to suggest it is the cell phones, or the cell phone providers network.

Are the mobiles with the issue on the same network?
Are these repeat calls to the same phone numbers?