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Operational, Basic, and Advanced Parameters
41-001343-02 REV04 – 05.2014 A-28
SIP TURN Parameters
Parameter –
sip stun port
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description Port number of the STUN server (also know as Simple Traversal of UDP through NAT)
Notes:
• The NAT IP configuration parameter takes precedence over the STUN and TURN
parameters.
• STUN does not work if the NAT device is symmetric.
Format Integer
Default Value 3478
Range 0 to 65535 (One (1) or two (2) port numbers separated by a comma)
Note:
The first is the primary and the second is the backup.
Example sip stun port: 3478,3479
Parameter –
sip turn ip
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description IP address and/or qualified domain name of the TURN server (also known as Traversal
Using Relay NAT).
TURN is a protocol that governs the reception of data over a Transmission Control Pro-
tocol (TCP) or a UDP connection by a single communications device operating behind
a NAT or firewall. A TURN server relays packets from an external IP address towards an
internal device only if that internal device has previously sent a packet through the
same TURN server to that particular external IP address.
The STUN/TURN configuration is only used for media (RTP traffic) that goes through
the server - not for signaling. (For signaling, you need to enable Rport if the NAT device
does not recognized SIP).
The STUN/TURN configuration applies globally to each phone.
If you configure both STUN and TURN on the phone, it discovers what type of NAT
device is between the phone and the public network. If the NAT device is full cone,
restricted cone, or port restricted cone, the phone uses STUN. If the NAT device is sym-
metric, the phone uses TURN. If you configure TURN only, the phone uses TURN with
the NAT discovery process. TURN is compatible with all types of NAT devices but can be
costly since all traffic goes through a media relay (which can be slow, can exchange
more messages, and requires the TURN server to allocate bandwidth for calls).
Note:
The NAT IP configuration parameter takes precedence over the STUN and TURN
parameters.
Format IP Address or Fully Qualified Domain Name (FQDN)
Default Value 0.0.0.0
Range Two (2) IP addresses or domain names separated by a comma
Note:
The first is the primary and the second is the backup.
Example sip turn ip: 10.50.103.12, turnbackup.aastra.com