[asterisk-users] Delay after Answer
brent at texascountrytitle.com
Tue Jun 7 13:54:33 CDT 2016
Well, I thought I had the problem solved. Ported everything over to
PJSip and build RDNS records for the phones and the server, but I am
still experiencing the problem on incoming calls.
On 6/7/2016 1:00 PM, Faheem Muhammad wrote:
> 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.
> On Tue, Jun 7, 2016 at 7:48 PM, Brent Davidson
> <brent at texascountrytitle.com <mailto:brent at 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*?*
> Brent Davidson*
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