I've faced the same issue. The issue was related to DNS, the reverse lookup query failure caused the delay around(7-9 seconds). The purpose of reverse lookup is to block IP Spoofing attacks.
Regards, Faheem On Tue, Jun 7, 2016 at 7:48 PM, Brent Davidson <br...@texascountrytitle.com> wrote: > I am having an issue with a couple of phones where they ring, but there is > a long delay after the phone is picked up before the audio starts. > > My setup: > > - Server running Asterisk 13.9.1, Dahdi 2.11.1 w/ OSLEC > - Server is CentOS 7 > - Quad core CPU with 16GB Ram > - 2 Snom 300 phones. > - NO NAT. Server and phone are on the same subnet with only a gigabit > switch between them. > - Digium TDM400 analog card with 2 incoming analog PSTN lines > > When a call comes in, the system answers, IVR plays, caller dials an > extension, Snom 300 rings, handset picked up. Caller continues to hear > ringing for another 7 to 10 seconds. Answerer hears a click, a quick burst > of audio, then silence, then another click and audio is engaged. > > I have tried both SIP and RTP debugging and there are absolutely no > messages indicating any timeout or retransmit. I am at a total loss. In > the past I've always been able to find an answer to issues like this on my > own, but this time I just don't know. I was even beginning to suspect the > network switch might be bad, but pinging between the server and the phones > shows no packet loss and 0.969ms average response time. > > What am I missing*?* > Thanks, > Brent Davidson > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > New to Asterisk? Join us for a live introductory webinar every Thurs: > http://www.asterisk.org/hello > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
-- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
