FAQ/What settings are available for "NAT traversal" on the snom m9?

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  • Network Address Translation (NAT) is typically used by a router or firewall to allow devices on a Local Area Network (LAN) with private IP addresses to share a single, public IP address.
  • To maintain the session the NATed snom m9 behind the firewall must keep sending messages to keep the session open. These messages are called “NAT Keep Alive” messages.
  • snom m9 provides the following provision-able settings for NAT Keep Alive:
outbound_method: crlf or stun 
outbound_tcp: Refresh interval in seconds for TCP connections (default is 60) 
outbound_udp: Refresh interval in seconds for UDP connections (default is 20)
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