Use IPv6 😃
Cheers
On 07/12/2020 23.01, David Cunningham 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.
We haven't found a solution in Asterisk to this, so are now looking to
Kamailio which acts as a load-balancing proxy in front of Asterisk for
one. For example, maybe we could use fix_nated_sdp, but only on 200
OK's with recvonly.
Has anyone else encountered this, and are there any recommended solutions?
Thank you in advance!
--
David Cunningham, Voisonics Limited
http://voisonics.com/ <http://voisonics.com/>
USA: +1 213 221 1092
New Zealand: +64 (0)28 2558 3782
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