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The device will send every 20 seconds (default) an UDP/TCP package an empty SIP message with just 2 * CRLF to the platform in configurable time interval to keep the NAT firewall open.

• New in software 2.42.0 or higher
• UDP
  • NAT refresh timer is set by default to 0 seconds
  • Timer = 0 means feature is disabled
  • Timer can be changed via auto-provisioning ("SipProvider.0.UDPKeepAliveTimerValue")
• TCP
  • Is activated automatically and set for 90 seconds
• Feature is an a platform related setting, if device has more SIP accounts, it does not send an UDP package per SIP account. It sends only one package every 20 seconds.
• Nx70 will send UDP / TCP packages containing only 2 x CR,LF
  
  

192.168.178.29	213.30.181.53	UDP	5060 → 5060 Len=4


Data (4 bytes)
    Data: 0d0a0d0a
    [Length: 4]