[asterisk-users] Delay after Answer

Faheem Muhammad faheem2084 at gmail.com
Tue Jun 7 13:00:55 CDT 2016

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>

> 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
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