[cisco-voip] CUBE to VXML the prompt starts playing before call is setup

[Jason Aarons (AM)]

I found out that that the audio was heard fine dialing a DID (eg 904-491-4444) but if you dialed the Toll Free number 800-553-2447 that is mapped to 904-491-4444 only then was the first prompt was being cutoff.  Sort of lead me to believe the carrier/pstn was the culprit.

I’ve seen this problem with Auto Attendants in Unity and Scripts in UCCX.  I recommend two seconds silent pause myself.

My rule of thumb is that first word chopoff is worse on international calls. Always seems that you get the first 1-2 seconds chopped off an international call.

From: Joe Pollere (AM)
Sent: Sunday, November 9, 2014 11:18 AM
To: Jason Aarons (AM); cisco-voip (cisco-voip at puck.nether.net)
Subject: RE: [cisco-voip] CUBE to VXML the prompt starts playing before call is setup

This customer Jason is referring to has their audio files setup with no lead-in silence (0ms). I’ve seen vague references that 100-500ms is a good best practice. Does anyone have any definitive references or experience as to what the Best Practice for lead in silence should be?

BTW packet capture (and rtp playout with wireshark) on the CUBE proved the audio was being sent to the carrier but is being truncated in the Carrier Network.

Thanks,

Joe

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Jason Aarons (AM)
Sent: Thursday, November 06, 2014 2:37 PM
To: cisco-voip (cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>)
Subject: [cisco-voip] CUBE to VXML the prompt starts playing before call is setup


Customer is running UCCE with a VXML gateway that has a CUBE in front of it.

The VXML prompts start to play before the CUBE sets up the audio, so once the audio comes in the end user has missed the first 1-2 words.  Normally I tell the customer to start record the prompts with a 2 second delay before speaking.

Any ideas why the CUBE/VXML audio isn’t cutting thru fast enough? Debug ccsip messages on cube/vxml.  They are using Early Offer as well.


itevomcid
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