[VoIP] SIP/firewall problem - the saga continues

[John Novack]

Vonage uses SIP
My Vonage ATA is behind my router
I use Stanaphone ( SIP ) both as my portal and for cheap LD ( prepaid )
I also use Gizmo ( SIP ) for even cheaper LD ( prepaid )
Right now my only problem is Stanaphone our doesn't pass DTMF properly. 
Since it usually only comes up once a month for th TCI conference call< 
i have yet to dig into it.
Now if I could only get all the BOD to bring up their own Asterisk box. . .

All of that said, SIP is a royal pain, but so is getting up some mornings.

John Novack


john jones wrote:
> Hmmmm.
>
> Doesn't Vonage use SIP?  I'd bet at least some Vonage
> customers use NAT!   Seems like Asterisk needs to be
> enhanced to use SIP through NAT reliably.
>
>
> --- "John R. Covert"
> <john_reads_cnet_via_archives at covert.org> wrote:
>
>   
>> You will never see an end to problems attempting to
>> do SIP connections
>> from outside a NAT router to an Asterisk box.
>>
>> Unless an Asterisk box is ON a public IP address
>> (i.e. the actual
>> interface _is_ the public address, with no NAT
>> translation) you will
>> have constant problems with clients trying to
>> register.  You may be
>> able to get one client to work, and then others will
>> stop working.
>>
>> There really is no NAT solution.
>>
>> If you intend to provide service to SIP clients you
>> MUST be on the
>> public internet.  It's fine to be behind a firewall,
>> but it must
>> _not_ be doing any NAT translation of _either_ ports
>> _or_ IP
>> addresses for the Asterisk box.  That means your
>> router must be
>> routing multiple IP addresses through to your
>> internal network,
>> or your router must be your asterisk box.
>>
>> To be a "service provider" (even for your own
>> portable ATAs or
>> phones or softclients), you really want to make your
>> Asterisk
>> box BE your firewall.  Two NICs, one plugged
>> directly into your
>> internet connection, the other one providing your
>> inside service.
>> Nothing else will work reliably.  Asterisk is simply
>> not designed
>> to handle NAT well at all, except for a small number
>> of cases of
>> outbound-only registrations.
>>
>> /john
>>
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>>     
>
>
>
>  
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