FOR TIPS, gUIDES & TUTORIALS

subscribe to our Youtube

GO TO YOUTUBE

14455 questions

17168 answers

28195 comments

0 members

We are migrating to our new platform at https://community.teltonika.lt. Moving forward, you can continue discussions on this new platform. This current platform will be temporarily maintained for reference purposes.
+1 vote
2,301 views 0 comments
by anonymous

1 Answer

+2 votes
by anonymous

Hello,

RUT230 has "VoIP passthrough support H.232 and SIP-alg protocol NAT helpers, allowing proper routing of VoIP packets"

The NAT Helpers section provides you the option to add firewall exceptions for some VoIP protocols, namely SIP and H.323. In other words, these functions provide a pass-through for VoIP communications between the router's LAN and WAN.

Technical explanation:

FTP, SIP and H.323 protocols are harder to filter by firewalls since they violate layering by introducing OSI layer 3/4 parameters in the OSI layer 7. NAT helpers are modules that are able to assist the firewall in tracking these protocols. These helpers create the so-called expectations that can be used to open necessary ports for RELATED connections. For example: FTP, GRE and PPTP helpers are enabled by default.

More information can be found in our Wiki page:

https://wiki.teltonika.lt/index.php?title=Firewall#Helpers

Best answer