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Introduction

The device will send an empty SIP message with just 2 * CRLF to the platform in configuratble 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 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]

Auto-provisioning

provisioning template example

<?xml version="1.0" encoding="UTF-8"?>
<provisioning version="1.1" productID="e2">

<nvm>

<param name="SipProvider.0.UDPKeepAliveTimerValue" value="20"/>

</nvm>
</provisioning>

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