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Introduction

The device will send every 20 seconds (default) an UDP/TCP package to the platform to keep the NAT firewall open.

  • New in software 2.41 or higher
  • UDP
    • NAT refresh timer is set by default to 20 seconds
    • Timer can be changed via auto-provisioning ("SipProvider.0.UDPKeepAliveTimerValue")
    • Timer = 0 means feature is disabled
  • TCP
    • Is activated automatically and set for 90 seconds
  • Feature is an platform 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.
  • SIP Registration fail/disabled has no influence on the feature.
  • UDP and TCP is supported, depends on platform setting.
  • Merkur 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]
...


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