Help > Using the Web Interface > Identities > NAT
NAT
SIP NAT traversal
Requirements:
•Configured DNS server
•If the option "active" is selected: Registrar enabled for the phone
Active
NAT traversal is performed by the telephone. To do this, you must also specify a STUN server.
*Caution: Each time a port is opened on the NAT router, this creates a potential security risk. Implement appropriate security measures.
Inactive
NAT traversal is not performed by the telephone. The SIP request also contains an "rport" part in which the IP addresses used here (local, public) are transported. The router which connects the local area network with the Internet should be a properly functioning SIP-aware router which performs NAT traversal.
*Further help under NAT
RTP NAT traversal
Requirement:
•Configured DNS server
Active
NAT traversal is performed by the telephone. To do this, you must also specify a STUN server.
*Caution: Each time a port is opened on the NAT router, this creates a potential security risk. Implement appropriate security measures.
*Note: If there are problems with unilateral call connections, a STUN server should be used.
Inactive
NAT traversal is not performed by the telephone. The router which connects the local area network with the Internet should be a properly functioning SIP-aware router which performs NAT traversal.
*Further help under NAT
NAT Keep-Alive Interval (sec.)
After the time specified here has passed, NAT Keep-Alive packets are sent to the firewall to maintain the NAT mapping.
*Note: Some providers lock accounts if the NAT Keep-Alive Interval is too short. As a rule, this is reported with error message 503 during SIP registration. If this problem occurs, it is recommended to raise the value (e.g. to 180).
*Further help under Identities
Use ICE
Enable the best possible transmission route to be found between the phone and PBX/provider.
*Note: ICE must only be activated if the other end supports ICE.
*Further help under Identities