[asterisk-users] One Way Delay in Audio Over Analog

[Brian Alexander]

Thanks for the replies! The analog card is a TDM400P. The system is
currently using asterisk-1.4 r81383 and zaptel-1.4 r2649.

I am told that the problem did not exist when the system was using
asterisk-1.2.10 and zaptel 1.2.9.1.

-Brian

On 12/31/07, Brian Alexander <balexander at visionpointsystems.com> wrote:
>
> I have been trying to track down the cause/fix for a problem and I am out
> of ideas... I am hoping one of you can point me in the right direction.
>
> The symptom is that when a calls is placed from an internal extension
> through an analog line to a number on the pstn the caller can hear the
> callee but the callee can not hear the caller for as long as ten seconds.
>
> The problem appears to happen fairly consistently on the same pstn
> numbers. However, I have not seen a common characteristic in those numbers.
> For example, one of them is a direct number to a cell phone and another is
> to a Verizon fiber-optic phone/data service.
>
> The problem does not seem to be related to the type of SIP phone being
> used by the caller - for example, we have tried both X-Lite and Polycom
> phones without a change in behavior.
>
> The problem does not appear to occur if the callee then calls into our
> system (at least the one time I was able to have this happen).
>
> Turning on or off echo cancellation and/or call progress does not seem to
> change the behavior.
>
> I will appreciate any ideas you have. I am certainly stumped.
>
> Thanks and Happy New Year!
> -Brian
>
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