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Does the Global Telecom VoIP Phone Adapter work behind a firewall?

April 26, 2017adapter firewall global phone Telecom voip

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Does the Global Telecom VoIP Phone Adapter work behind a firewall?

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Our chosen Phone Adapter, the Grandstream 486 ATA, works behind most firewalls, but not those which completely restrict all traffic. If you have problems with one-way speech this could be down to misconfigured router or firewall settings. Please contact our support line for advice on Port Forwarding, or default DMZ settings. In some cases your router may require a Firmware upgrade to allow SIP traffic to be routed correctly.