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The Internet Gate can enable SIP connectivity for remote users that use NAT devices without SIP support. It can adapt to characteristics of remote NAT devices. | The Internet Gate can enable SIP connectivity for remote users that use NAT devices without SIP support. It can adapt to characteristics of remote NAT devices. | ||
- | You might need to purchase a [[:license]] to be able to use FENT in your unit. | + | **Using FENT you can allow people behind non-SIP-capable NAT firewalls to register on your Internet Gate's SIP server.** |
- | FENT sends keep-alive packets to remote SIP clients behind non-SIP-capable firewalls to keep the SIP communications channel free to them. | + | :!: You might need to purchase a [[:license]] to be able to use FENT in your unit. |
+ | You configure FENT on the [[:web GUI:Advanced SIP Settings]] page. | ||
+ | |||
+ | FENT sends keep-alive packets to remote SIP clients behind non-SIP-capable firewalls to keep the SIP communications channel open to them. The keep-alive packets are SIP messages that are sent more often than the remote firewall's timeout. | ||
+ | |||
+ | {{:sip:fent_1.png|Far End NAT Traversal}} | ||
+ | |||
+ | There are two methods used for keep-alive: | ||
+ | * **REGISTER**: by lowering the REGISTER expiration timeout the SIP client behind the remote NAT will REGISTER often enough for keeping the connection open. | ||
+ | * **OPTIONS**: the Internet Gate will send SIP OPTIONS messages at regular intervals to the client behind the remote NAT, keeping the connection open. | ||
+ | You can enable both methods, then the REGISTER method is tried first and if it does not work properly the OPTIONS method is used. | ||
+ | |||
+ | ===== Shortest media path ===== | ||
+ | By enabling **Detect endpoints behind same NAT** you allow SIP clients behind the same remote NAT making local calls to each other to send media locally between them on that LAN. | ||
+ | |||
+ | {{:sip:fent_2.png|media on remote LAN}} | ||