Turn off firewall and SIP ALG (if available on the router) and see if it works. If it doesn't work, you can try the port forwarding option. If nothing works, contact support.
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Re: The phone adapter doesn't work after replacing my router
Turn off firewall and SIP ALG (if available on the router) and see if it works. If it doesn't work, you can try the port forwarding option. If nothing works, contact support.
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