[Asterisk-Users] Weird Over Lapping Asterisk Calls via SIP Phones

[Chris Travers]

asterisk at emptyhole.net wrote:

>I am trying to create an IVR system that uses both POTS and IP phones
>and I have a few problems that I encountered with the IP SIP phones
>(Grandstream Budge Tone 102).
>
>1. When a user hits the hook fast enough, the user can create multiple
>IVR connections that gives the appearance of an echo that is phased a
>few seconds apart. The way to reproduce this is by hitting the hook
>fast and furious. The telltale sign of multiple connections is when you
>get an echo from the IVR and or static caused by the multiple
>prompting. What could be causing this and how do I solve this. Here is
>the SIP config.
>
>2. Poor audio quality over VPN broadband and direct Full T1. The audio
>recordings (in uncompress WAV format) that comes out at the IVR end is
>either muddled, static, or contains gaps. This occurs on both broadband
>and T1. What can be done to improve the audio recordings so they are
>audible.
>  
>
What sort of VPN?  There are potential issues under certain 
circumstances with latency involved in the connection.  These can be 
fixed however.

I larger issue is likely to be QOS in general.

>3. How do I set up QOS on a broadband VPN when I do not control the
>bandwidth of the Internet?
>  
>
You can definitely have issues with general internet traffic if you set 
up VPN on your router.  However, these are far less serious than if you 
don't.  You want to set up QOS on whatever network interface is closest 
to the internet and can control all of the traffic between your network 
and the internet.

Best Wishes,
Chris Travers
Metatron Technology Consulting
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