[asterisk-users] NAT problem with recvonly calls

Dovid Bender
Thu, 03 Dec 2020 00:01:14 -0000

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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