[asterisk-users] NAT problem with recvonly calls

[David Cunningham]

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
>> --
>> _____________________________________________________________________
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>>
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>>
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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
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