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does anybody know a SIP application layer gateway(nat) software
the best would be : freeware, for unix like os, but can be linux also....

thanx a lot
3 Solutions
Its called a STUN server or sometimes just a SIP Proxy server. Have a look at http://www.voip-info.org/wiki-STUN
There are links there to some open source versions.
simkoAuthor Commented:
thanks ..
stun is nice but i need some kind of session border controller software
stun has to be supportrd by the clients

the scenario

softswich -------- NAT(SBC) ------ phones
In that case you will need a NAT device which supports it. I know the Cisco PIX firewall supports SIP (fixup protocol sip). Some other similar grade firewalls probably support it but I dont know of any off hand.
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I would be intrested too... linux based specifically... we looked at a juniper/kagoor box and at acme packet... but, they were all too much for a few remote clients
simkoAuthor Commented:
kagoor is nice but the specification of the product don't match the performance :(
the acme box is nice works fine but expensive is a weak word

i am looking for a software SBC

Reid PalmeiraTelecom EngineerCommented:
the easiest way for you to accomplish this is going to be matching your SBC with the softswitch and voip caapable devices. i don't know of too many enterprise/carrier class SBC's that are open. most are going to cost you a pretty good chunk of change and if you have your own softswitch you're not really looking for small scale deployment. Jasomi is pretty decent from my experience, but make sure you work with their higher level tech people. Nextone is pretty good, but quirky.

what kind of softswitch? have you looked through their compatability/certification list?
simkoAuthor Commented:
I solved it in another way
but anyway thanks

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