> On 8 Dec 2020, at 18:55, Richard Fuchs <[email protected]> wrote: > > Use IPv6 ๐
While I like that proposal, assuming that IPv6 will not have a stateful firewall is propably not a good assumption. So I suspect that an IPv6 firewall would not let the packets in if there is not outbound traffic first. I do like Ovidius ICE-based solution and would like to add RTCP - if muxed it would open the port, but the likelyhood that itโs implemented is propably low. IPv6 greetings! /O :-) > > 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 >> >> >> _______________________________________________ >> Kamailio (SER) - Users Mailing List >> [email protected] <mailto:[email protected]> >> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >> <https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users> > _______________________________________________ > Kamailio (SER) - Users Mailing List > [email protected] > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
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