[asterisk-users] Delay after Answer

Darryl Moore darryl at moores.ca
Tue Jun 7 10:04:23 CDT 2016

I've seen this sort of thing where a DNS server is programmed in 
resolv.conf but is not accessible over the network. Threads get blocked, 
and you have to wait for the DNS query to timeout.

On 16-06-07 10:48 AM, Brent Davidson 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*
> *

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