Voip Calls thru speed fusion

I have a VPN from site1 to site2 which mostly use for VOIP calls…everything is working fine …
But sometimes the person in Site1 cant hear Site2 person voice when site2 guy calls… But site2 person can hear the Site person voice…
But this issue is not happening when site1 person calls site2 guy
Is it any bandwidth issue ?

Please try compatibility mode under: Network> Misc. Settings> Service Passthrough Support> SIP and let us know if that resolves the issue.

Thank you for sharing the information as I recently got the new connection of voip from the experts. I got it installed for my business.