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As an additional recommendation, Set "NAT enabled" to Yes, and on the "NAT address" parameter, enter the External (publicly addressable) IP address of Router or firewall, if any.
Important: Please make sure your timer_register_expires is set to 180 seconds. Lowering the setting to 180 seconds refreshes the SIP invite and creates a new dynamic route every 180 secs. The option is also available directly on the phone menu through: Settings -> SIP Configuration -> Register Expires