On 10/11/06, Jon Radel <[EMAIL PROTECTED]> wrote:
>> If my memory serves me right, SIP actually has ALG built into the
>> standard itself and www.opensip.org might already give you what you want.
>
> Hmm, wasn't aware of that. Do you have any specific RFC or 3GPP spec
> number that I could check out concerning this?
>
> -Martin
>
The standard? But SIP has so many.....
I was asking because although I'm familiar with the usual SIP RFCs
(3261 and family) I was not aware of the "SIP actually has ALG built
into the standard itself" notion that Girish mentionned and I wanted
to know if there was any actual documentation to support this.
But the core spec, RFC 3261, http://www.rfc-editor.org/rfc/rfc3261.txt ,
doesn't touch on the topic at all so far as I've ever noticed.
Yeah, I've never heard of this in 3261 either.
NAT fixup for SIP is a nasty thing and I've seen a number of broken
implementations and incompatible solutions. As a hosted IP PBX
provider, we've had the best luck using session border controllers at
the edge of our network, which are configured to assume that phones are
behind NAT.
Yeah, we use SBCs in IMS as well.
Unfortunately, SIP is nowhere near being "a" standard where you can
assume interop just because you implement a bunch of RFCs. Especially
if you mix NAT in.
Add to that the 3GPP and OMA additions for IMS and it gets even wilder.
-Martin
--
"Suburbia is where the developer bulldozes out the trees, then names
the streets after them."
--Bill Vaughan
