Can't Hear the caller - New User

[holmes4]

This is usually a port forwarding problem, but if you really do mean "hub" and not router, then that would not apply.

[brmstech]

Yes, it's a Hub/Switch and the problem happens every 3-4 days.








Modem->Hub->GrandStream->AT&T Dect 6.0 wireless phone/base + extension phone

[tritch]

This is a strange network setup. Do you have other devices attached to this switch other than the GrandStream? If so, how are you correctly "routing" the traffic between the devices? Is the cable/DSL modem a combo unit with a built-in router? If so, then you will need to forward a range of UDP ports to the Grandstream within this unit.