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Forums » Earthlink Peer to Peer? » NAT Support?
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elias
Premium,VIP
join:2000-07-24
Miami, FL
clubs:		reply to DrTCP
Re: NAT Support?

That's pretty odd...

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

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


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

1 edit		reply to elias
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
to forum · permalink · · 2004-09-16 15:36:27 · Reply to this


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

reply to DrTCP
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
to forum · permalink · · 2004-09-16 14:31:38 · Reply to this


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

reply to elias
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.
to forum · permalink · · 2004-09-16 11:59:24 · Reply to this


Karl Bode
News Guy
join:2000-03-02

Host:
Road Runner
PC gaming GAMES
PC gaming Tech
reply to elias
It doesn't support NAT now, but it's very easily something others can implement:

quote:
Will EarthLink SIPshare work behind NAT?

No. All messaging, including the file transfer protocol, are based on UDP. If you want to extend EarthLink SIPshare by incorporating something like STUN for NAT traversal, by all means do so.
to forum · permalink · · 2004-09-16 10:39:06 · Reply to this


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

  I don't get it...

SIP works fine behind NAT.

The last line in the article say it doesn't work behind NAT.

This is supposed to be a SIP-based P2P? Doesn't seem to make sense.

-- Elias
--
Crunching the Midnight Oil
to forum · permalink · · 2004-09-16 10:33:00 · Reply to this
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