[asterisk-users] NAT problem with recvonly calls

[David Cunningham]

Hi Dovid,

Thanks for that. Can you explain how the Progress() and/or Playback()
actually help the NAT problem? I'm trying to figure out how it tells
Asterisk the correct address to send the RTP to.


On Thu, 3 Dec 2020 at 16:10, Dovid Bender <dovid at telecurve.com> wrote:

> David,
>
> You should be able to do that via the agi as well.
>
> On Wed, Dec 2, 2020 at 20:32 David Cunningham <dcunningham at voisonics.com>
> wrote:
>
>> Hi Dovid,
>>
>> We're using Enswitch so it uses AGI rather than a regular Asterisk
>> dialplan, but perhaps sending it to a custom-made Asterisk context with the
>> lines you suggest could be the best way forward.
>>
>> Thank you for that.
>>
>>
>> On Thu, 3 Dec 2020 at 13:01, Dovid Bender <dovid at telecurve.com> wrote:
>>
>>> David,
>>>
>>> Does Asterisk send a 180 or a 183 with SDP? We have found that using
>>> these two lines help (where xc is a 500ms blank sound file)
>>> Exten => _X.,n, Progress()
>>> Exten => _X.,n, Playback(xc,noanswer)
>>>
>>>
>>> On Wed, Dec 2, 2020 at 4:30 PM David Cunningham <
>>> dcunningham at voisonics.com> wrote:
>>>
>>>> Hello,
>>>>
>>>> We have a  problem with a SIP doorbell device which sends media one way
>>>> only, and NAT at the receiving device.
>>>>
>>>> When the doorbell button is pressed it makes a call to a configured
>>>> destination. Since the doorbell only sends and doesn't receive it sends the
>>>> INVITE with sendonly in the SDP, and the destination then replies with a
>>>> 200 OK with recvonly in the SDP.
>>>>
>>>> The problem is that the destination is behind NAT, and its reply
>>>> contains a private network IP in the SDP. Normally Asterisk when nat=yes
>>>> works around that by adjusting the destination for RTP to be the address it
>>>> actually receives audio from, however because this device is recvonly
>>>> Asterisk never receives audio from it. This means Asterisk keeps trying to
>>>> send the doorbell's RTP to the private network IP which of course fails,
>>>> and the destination never gets the RTP from the doorbell.
>>>>
>>>> Does anyone know how to work around this issue?
>>>>
>>>> Thank you in advance,
>>>>
>>>> --
>>>> David Cunningham, Voisonics Limited
>>>> http://voisonics.com/
>>>> USA: +1 213 221 1092
>>>> New Zealand: +64 (0)28 2558 3782
>>>> --
>>>> _____________________________________________________________________
>>>> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>>>>
>>>> Check out the new Asterisk community forum at:
>>>> https://community.asterisk.org/
>>>>
>>>> New to Asterisk? Start here:
>>>>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>>>>
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>>>
>>> --
>>> _____________________________________________________________________
>>> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>>>
>>> Check out the new Asterisk community forum at:
>>> https://community.asterisk.org/
>>>
>>> New to Asterisk? Start here:
>>>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>>>
>>> asterisk-users mailing list
>>> To UNSUBSCRIBE or update options visit:
>>>    http://lists.digium.com/mailman/listinfo/asterisk-users
>>
>>
>>
>> --
>> David Cunningham, Voisonics Limited
>> http://voisonics.com/
>> USA: +1 213 221 1092
>> New Zealand: +64 (0)28 2558 3782
>> --
>> _____________________________________________________________________
>> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>>
>> Check out the new Asterisk community forum at:
>> https://community.asterisk.org/
>>
>> New to Asterisk? Start here:
>>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>>
>> asterisk-users mailing list
>> To UNSUBSCRIBE or update options visit:
>>    http://lists.digium.com/mailman/listinfo/asterisk-users
>
> --
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> Check out the new Asterisk community forum at:
> https://community.asterisk.org/
>
> New to Asterisk? Start here:
>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users



-- 
David Cunningham, Voisonics Limited
http://voisonics.com/
USA: +1 213 221 1092
New Zealand: +64 (0)28 2558 3782
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