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The Graveyard - Products No Longer Supported => DIR-655 => Routers / COVR => Beta Code! => Topic started by: blk1948 on November 16, 2008, 09:42:39 AM

Title: SIP ALG
Post by: blk1948 on November 16, 2008, 09:42:39 AM

I read the manual on the SIP ALG setting which suggests that this setting "Allows devices and applications using VoIP (Voice over IP) to communicate across NAT."  Is a similar ALG possible in firmware which would allow VPN to communicate across NAT?

Title: Re: SIP ALG
Post by: Lycan on November 17, 2008, 08:59:23 AM

Yes, they're labeled PPTP and IPSec.

Title: Re: SIP ALG
Post by: blk1948 on November 17, 2008, 10:21:54 AM

But do they communicate over NAT like the description for the SIP ALG states?

Title: Re: SIP ALG
Post by: funchords on November 26, 2008, 11:35:33 AM

Quote from: blk1948 on November 17, 2008, 10:21:54 AM

But do they communicate over NAT like the description for the SIP ALG states?

SIP is a different standard, but the general concept is the same for all Application Layer Gateways -- undo the damage caused by NAT traversal.