<div dir="ltr"><div>Hi Joshua,</div><div><br></div><div>You're right, it was a firewall problem. One of those things where testing a change in one place throws up a previously unseen problem somewhere else! Thanks for the tip.</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 19 May 2022 at 21:18, Joshua C. Colp <<a href="mailto:jcolp@sangoma.com">jcolp@sangoma.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr">On Thu, May 19, 2022 at 6:04 AM David Cunningham <<a href="mailto:dcunningham@voisonics.com" target="_blank">dcunningham@voisonics.com</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi Dovid and Joshua,</div><div><br></div><div>The PSTN is sending RTP immediately after the 200 OK, on both legs of the call. Since the PCAP taken on the Asterisk server itself shows this RTP from the PSTN then presumably it can't be a network issue preventing the RTP.<br></div><div><br></div><div>Having said that, the problem is not reproduced when the peer is another Asterisk server on the same network, and that does point to a network difference.<br></div><div><br></div><div>Is there any other way in which the RTP keepalive might affect Asterisk's behaviour?<br></div></div></blockquote><div><br></div><div>No, the option only does anything if no RTP has been sent for a period of time. It doesn't fundamentally alter the behavior of RTP in general.</div></div><div><br></div>Another thing to consider is that a PCAP is taken before any local firewall rules are applied, which can give a false impression that the firewall on the system is not an issue when in reality it can be. That's something to check.<br clear="all"><div><br></div>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div style="font-family:tahoma,sans-serif"><font color="#073763">Joshua C. Colp</font></div><div style="font-family:tahoma,sans-serif"><font color="#073763">Asterisk Technical Lead</font></div><div style="font-family:tahoma,sans-serif"><font color="#073763">Sangoma Technologies</font></div><div style="font-family:tahoma,sans-serif"><font color="#073763">Check us out at <a href="http://www.sangoma.com" target="_blank">www.sangoma.com</a> and <a href="http://www.asterisk.org" target="_blank">www.asterisk.org</a></font><br></div></div></div></div></div></div></div></div></div></div></div>
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