Reference12r2:IP4/General/STUN

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STUN Servers

The default STUN servers that should be used on a box by ICE and SIP, if no configuration is given at the individual registrations. The field must contain a string in the following format:

  • up to two STUN servers which shall be queried in parallel, separated by semi-colon (;)

Each STUN server is denoted as

  • either a single DNS name and an optional port (e.g. stun.example.com:1234)
  • or a comma separated list of one or two IP addresses and optional ports (e.g. 172.16.13.1:1234,172.16.13.2)


This format is also used for the STUN server configuration in the DHCP innovaphone Vendor Option 219 .

TURN Servers

You can configure up to two TURN server in one of the following formats.

  • either a single DNS name and an optional port (e.g. turn.example.com:1234)
  • or a comma separated list of one or two IP addresses and optional ports (e.g. 172.16.13.1:1234,172.16.13.2)

A TURN server configuration can optionally be followed by a protocol specification such as e.g. turn.company.tld?transport=prot where prot can be either tcp or udp.

TURN Username

The user name for communication with the TURN server.

TURN Password

The password for communication with the TURN server.

Slow STUN/TURN Server

Increase the default timeout for a established TURN session from 300ms to 1,5 seconds.

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