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Originally Posted by fataldata
I was having some similar issues described as an underwater sound or tunnel like. The problem could only be detected by the off pbx endpoint, in otherwords the VoIP caller did not notice any problems. In any case our VoIP problems were resolved by installing new Routers and Switches that support QoS.
My only advice. Make sure your network supports QoS.
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In addition to supporting QoS, make sure that voice is given priority over data. If the network gets congested all transmissions will take a hit. Data can recover from that, voice cannot.