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AXIS C3003-E Network Speaker
Voice over IP (VoIP)
Port Settings
• SIP port – Enter the port used for SIP sessions. The signalling trafc through this port will be non-encrypted. The default
port number is 5060.
• SIP TLS port – Enter the port used for SIPS sessions and TLS-secured SIP sessions. The signalling trafc through this port
will be encrypted using Transport Layer Security (TLS). The default port number is 5061.
Network Address Translation (NAT) Traversal (port forwarding)
Use NAT traversal when the Axis product is connected to the network behind a NAT router or rewall device.
VoIP services require clients to be servers as well, and many VoIP services carry IP address and port information in the application
data. Therefore, Axis products behind Network Address Translation (NAT) devices such as network routers need to use special
protocols for NAT traversal (port forwarding) so that incoming calls can be linked to the correct host.
Without SIP-specic port forwarding, users of clients within the same private network would be able to talk to each other
(peer-to-peer communication) but users of clients in different networks would not.
The following NAT traversal settings are available:
• ICE – Interactive Connectivity Establishment (ICE). See page 13.
• STUN – Session Traversal Utilities for NAT (STUN). See page 13.
• TURN – Traversal Using Relays around NAT (TURN). See page 13.
Each NAT traversal protocol has its benets and aws. The aws can be reduced by making sure that the network and its connected
devices support all these protocols.
For more information about the product’s general NAT traversal settings, see NAT traversal (port mapping) for IPv4 on page 27.
Interactive Connectivity Establishment (ICE)
Interactive Connectivity Establishment (ICE) enables the product to send a request that includes multiple addresses to the receiving
device. In its response, the receiving device also includes multiple addresses. Through a process of connectivity checks, also called
handshakes, the channel for communication is established.
ICE increases the chances of nding the most efcient path to successful communication between peer devices. If you also enable
STUN and TURN, you improve the ICE protocol’s chances of nding the most efcient path to successful communication, not just
between peers but between all devices on either side of the NAT device.
To use the ICE protocol for NAT traversal, select Enable ICE.
Session Traversal Utilities for NAT (STUN)
Session Traversal Utilities for NAT (STUN) is a client-server network protocol that enables the product to ask a STUN server on the
Internet for a mapped public IP address. The STUN server response includes this IP address and port 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 port-restricted cone NAT setups. STUN is fast because it
is lightweight. However, STUN does not allow incoming messages from symmetric NATs, and it cannot communicate with a peer
behind the same NAT device.
To use the STUN protocol 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 protocol that enables the product to ask a TURN server for a
mapped IP address. The TURN server responds with its IP address and port so that the client can use them in its SIP messages.
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