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Forums » Earthlink Peer to Peer? » NAT Support?
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DrTCP
Yours truly
Premium,ExMod 1999-04
join:1999-11-09
Round Rock, TX

Re: NAT Support?

said by elias See Profile:
SIP works fine behind NAT.
This is not true. Make a google search regarding SIP and NAT issues. The NAT gateway/firewall must be SIP aware to pass through standard SIP protocol. There are currently a bunch of routers that fail SIP and they need new firmware to function.

Yes, there are efforts to add to the SIP protocol to work behind NAT gateways but not all SIP device and gateway supports this.
permalink · 2004-09-16 11:59:24 · Print · Reply to this

elias
Premium,VIP
join:2000-07-24
Miami, FL
clubs:

Re: NAT Support?

I disagree.

My previous job was at a SIP-based VoIP provider. We had SIP softphones on the computer as well as hardware phones.

I would say that about 99% of the time they worked just fine behind NAT w/out any configuration being done on the router.

-- Elias
--
Crunching the Midnight Oil
permalink · 2004-09-16 14:31:38 · Reply to this

DrTCP
Yours truly
Premium,ExMod 1999-04
join:1999-11-09
Round Rock, TX

1 edit

Re: NAT Support?

said by elias See Profile:
I would say that about 99% of the time they worked just fine behind NAT w/out any configuration being done on the router.
Your NAT gateway was probably SIP enabled. They need a SIP ALG code to do that (Application Level Gateway) or your VOIP softphones/hardphones implemented STUN extensions for VOIP.

See the following good whitepaper(s):

»www.sipcenter.com/sip.nsf/html/W···rsal.pdf
»www.intertex.se/upfiles/Intertex···aper.pdf
»www.newport-networks.com/whitepa···sal.html
permalink · 2004-09-16 15:36:27 · Print · Reply to this

elias
Premium,VIP
join:2000-07-24
Miami, FL
clubs:

Re: NAT Support?

That's pretty odd...

We found it to work on plenty of old routers, etc.

-- Elias
--
Crunching the Midnight Oil
permalink · 2004-09-16 15:48:24 · Reply to this
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