please check and help to reply at earliest.
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What type of Voip account are you using?
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Is it SIP or IAX2? Obtain this information from your VoIP provider or system administrator.
ans: SIP
If your report is concerning audio related issues - what
audio codecs are you using?
ANS: audio is not audible one sided while connect on VPN
Are you able to recreate the issue every time you try?
ANS: no need to create issue exterenally , it is happening always while connected with VPN
Is it the first time when the issue appears?
ANS:no , it's very old.