[VoiceOps] Call established before audio path

Peter E peeip989 at gmail.com
Mon Jun 16 12:16:39 EDT 2014

+1 for that answer, David. It went beyond accurate and was "accurate with style."

On Jun 16, 2014, at 10:07 AM, "Hiers, David" <David.Hiers at adp.com> wrote:

That handles the IVR case, sure, but the harried, highly-caffeinated receptionist with a headset that can strike the "answer" button like a cobra remains a persistent challenge.


-----Original Message-----
From: VoiceOps [mailto:voiceops-bounces at voiceops.org] On Behalf Of Ryan Delgrosso
Sent: Friday, June 13, 2014 09:41
To: voiceops at voiceops.org
Subject: Re: [VoiceOps] Call established before audio path

Ive seen this pretty regularly, often times it happens when there are multiple sip servers in the path, and the final 200ok with SDP takes a second to get to the endpoint. Especially when something that does symmetric latching is in the path. Its not uncommon for symmetric latching to cause this as the called audio will start flowing the moment it sends the 200ok, but the 200ok still has to be received by the caller and it has to begin sending audio for the latch to take and have the audio routed both ways.

The answer is typically a 0.5 second delay at the start of your prompt to insulate against this.

> On 6/13/2014 9:07 AM, Brian Taylor wrote:
> We have customers who are reporting that when people call into them 
> that the beginning of the greeting is not being heard.
> It appears that the phones think the call is ready before there is a 
> complete audio path. We see this the most on calls that come in from 
> the PSTN. Long distance or toll free calls are the worst.
> We have a Broadworks system that uses Lucent 5010 (Telica) switches 
> for the connections to the PSTN.
> The symptom seems to be very similar for all of our PSTN connections, 
> to multiple carriers.
> I'm just curious if anyone has any experience with this problem, or if 
> anyone has any suggestions to get to the bottom of the issue.
> Any assistance or inspiration would be greatly appreciated.
> Thank you,
> Brian Taylor
> Socket Telecom, LLC
> brian at socket.net
> _______________________________________________
> VoiceOps mailing list
> VoiceOps at voiceops.org
> https://puck.nether.net/mailman/listinfo/voiceops

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