DrTCP
Yours truly
Premium,ExMod 1999-04
join:1999-11-09
Round Rock, TX
| reply to elias
Re: NAT Support?
said by elias  :
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. |
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elias
Premium,VIP
join:2000-07-24
Miami, FL
clubs: 
| 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 |
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DrTCP
Yours truly
Premium,ExMod 1999-04
join:1999-11-09
Round Rock, TX
1 edit | said by elias :
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 |
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elias
Premium,VIP
join:2000-07-24
Miami, FL
clubs: | That's pretty odd...
We found it to work on plenty of old routers, etc.
-- Elias
--
Crunching the Midnight Oil |
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