[asterisk-users] Same provider - IAX sounds bad, SIP sounds great

[Steve Totaro]

On Wed, Feb 29, 2012 at 9:44 AM, Kevin P. Fleming <kpfleming at digium.com>wrote:

> On 02/29/2012 08:22 AM, Alejandro Imass wrote:
>
>  We use the HT-286, the server is on a public IP the nat setting on
>> asterisk is set to yes and without port re-direction the ATAs have
>> never connected from a private network, so I honestly find this "SIP
>> plug and play" very hard to believe. But if it is true, then maybe you
>> can actually help us figure out all the NAT issues we've had with SIP
>> for the past 5 years. Perhaps, it is simply ignorance on our side and
>> we have something fundamentally wrong in our set-up somewhere that may
>> be have been causing these issues with NAT.
>>
>
> The number of 'plain' SIP endpoints deployed behind consumer-grade NAT
> devices talking to Asterisk servers on public IP addresses is in the
> millions, if not the tens of millions. As has already been posted, Asterisk
> itself handles all the far-end NAT traversal duties necessary for this to
> work; neither the remote endpoint nor the NAT device need to do anything
> special, nor do they require any configuration.
>
> Rather than post a lengthy exposition on how widespread your network is
> and how technically astute your people are, you would probably accomplish
> much more to setup a simple test scenario as has been previously suggested,
> and if it does not work for you, post the details of the scenario and the
> failure here.
>
>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at www.digium.com & www.asterisk.org
>
>
Agreed with one exception, the endpoint behind the NAT DOES need to be
setup correctly to keep the router from seeing inbound traffic to the
device as unsolicited and drop it.  That is a function of the router but
keep alives from Qualify on the Asterisk side, and setting the device to
register every few minutes will keep that mapping open and alive, letting
traffic pass as solicited.

Thanks,
Steve Totaro
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