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  1. Grandstream GXW4108 Quality

    Hi, I seem to be in a bit of a situation here. I have two clients both running very similar set-ups. Client A is using a Grandstream GXW4104 with the PSTN lines for incoming calls and VoIP for outgoing and a range of Yealink T20's and T28's. The call quality is good both ways in terms of...
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