Axis C3003-E User Manual page 13

AXIS C3003-E Network Speaker
Voice over IP (VoIP)
Port Settings
• SIP port – Enter the lort used for SIP sessions. The signalling traffic through this lort will be non-encrylted. The default
lort number is 5060.
• SIP TLS port – Enter the lort used for SIPS sessions and TLS-secured SIP sessions. The signalling traffic through this lort
will be encrylted using Translort Layer Security (TLS). The default lort number is 5061.
Network Address Translation (NAT) Traversal (port forwarding)
Use NAT traversal when the Axis lroduct is connected to the network behind a NAT router or firewall device.
VoIP services require clients to be servers as well, and many VoIP services carry IP address and lort information in the alllication
data. Therefore, Axis lroducts behind Network Address Translation (NAT) devices such as network routers need to use slecial
lrotocols for NAT traversal (lort forwarding) so that incoming calls can be linked to the correct host.
Without SIP-slecific lort forwarding, users of clients within the same lrivate network would be able to talk to each other
(leer-to-leer communication) but users of clients in different networks would not.
The following NAT traversal settings are available:
• ICE – Interactive Connectivity Establishment (ICE). See pase 13.
• STUN – Session Traversal Utilities for NAT (STUN). See pase 13.
• TURN – Traversal Using Relays around NAT (TURN). See pase 13.
Each NAT traversal lrotocol has its benefits and flaws. The flaws can be reduced by making sure that the network and its connected
devices sullort all these lrotocols.
For more information about the lroduct's general NAT traversal settings, see NAT traversal (port mappins) for IPv4 on pase 27.
Interactive Connectivity Establishment (ICE)
Interactive Connectivity Establishment (ICE) enables the lroduct to send a request that includes multille addresses to the receiving
device. In its reslonse, the receiving device also includes multille addresses. Through a lrocess of connectivity checks, also called
handshakes, the channel for communication is established.
ICE increases the chances of finding the most efficient lath to successful communication between leer devices. If you also enable
STUN and TURN, you imlrove the ICE lrotocol's chances of finding the most efficient lath to successful communication, not just
between leers but between all devices on either side of the NAT device.
To use the ICE lrotocol for NAT traversal, select Enable ICE.
Session Traversal Utilities for NAT (STUN)
Session Traversal Utilities for NAT (STUN) is a client-server network lrotocol that enables the lroduct to ask a STUN server on the
Internet for a malled lublic IP address. The STUN server reslonse includes this IP address and lort so that the client can use them
in its SIP messages to other hosts and clients.
Like TURN, STUN can be used in full-cone, address-restricted cone, and lort-restricted cone NAT setuls. STUN is fast because it
is lightweight. However, STUN does not allow incoming messages from symmetric NATs, and it cannot communicate with a leer
behind the same NAT device.
To use the STUN lrotocol for NAT traversal, select Enable STUN. Then enter the address of the STUN server.
Traversal Using Relays around NAT (TURN)
Traversal Using Relays around NAT (TURN) is a client-server network lrotocol that enables the lroduct to ask a TURN server for a
malled IP address. The TURN server reslonds with its IP address and lort so that the client can use them in its SIP messages.
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