[Serusers] NAT ping and consumer router

[Andres]

>>Anyway, if you can program your ALG and fix any problem one might have, why
>>isn't it a better choice? 
>>
This depends on wether you have control or not.  As a service provider 
we have to deal with hundreds of different NATs/Routers all over the 
world.  We do not have the luxury of demanding users to buy a certain 
NAT device (and some NATs are even embedded in the modem provided by 
their ISPs).  On the other hand we do suggest our users get one of our 
"supported" UAs which have been heavily tested by us.  That being said, 
our number #1 issue right now are broken SIP Aware NATs all over the 
world.  We are constatly having to move these users to other ports 
besides 5060.  I wish NAT vendors would give up on this idea.  We prefer 
to solve this by a combination of STUN/RTPProxy which has worked 
flawlessly for us.

>Secondly, I don't share your optimism on that ALG 
>
>vendors will get
>the application logic right.
>
I agree...please stop this futile attempt! (I can understand a handful 
of vendors are smart enough to get this right, but for sure it is 
impossible for most to do it)

> Field experience shows that my pesimistic
>attitude is quite realistic. There were even bizzar products that
>claimed support for SIP but actually mangled it in a way which broke
>
>  
>


-- 
Andres
Network Admin
http://www.telesip.net