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 Polycom phone not registering

This is a common issue with polycom phones specifically VVX410 Series.On the administration GUI under the line you are configuring Just below "Display Name" you will see "Address".Address is...

 VoIP Account Not Recieving Calls

SIP ALG (Application Layer Gateway) a.k.a SIP Passthrough is a feature which is enabled by default in most modern routers and inspects VoIP traffic as it passes through and modifies the messages...