asterisk users - Jan 2018 - Running on virtual machine and audio not intelligable

Hi All,
Running asterisk 11.25.3, the /proc/cpuinfo says
Intel(R) Xeon(R) CPU           X5675  @ 3.07GHz

lsmod | grep dahdi gives
dahdi_transcode        16384  1 wctc4xxp
dahdi_voicebus         61440  2 wctdm24xxp,wcte12xp
dahdi                 225280  11
wctdm24xxp,wcfxo,wctdm,dahdi_transcode,oct612x
dahdi_voicebus,wcb4xxp,wct1xxp,wct4xxp,wcte11xp,wcte12xp
crc_ccitt              16384  2 wctdm24xxp,dahdi

There are no cards in the VM - just the CentOS 7.4 operating system. I'm
actually running 4.4.92 from elrepo as the kernel.

I am using the confbridge with about 100 devices in the "one way"
conference and the audio is not intelligible. Sending audio to a single
endpoint is fine.

dahdi_test running when nothing is happening is 99.8 running with the ALL
100 units in conf is about 99.6.

What can I do do get audio where it needs to be ?  I believe the
environment is VMware.

Thanks,

Jerry
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why load or even install dahdi if no cards are used?

On Jan 24, 2018 10:30 PM, "Jerry Geis" <jerry.geis at gmail.com>
wrote:
> Hi All,
> Running asterisk 11.25.3, the /proc/cpuinfo says
> Intel(R) Xeon(R) CPU           X5675  @ 3.07GHz
>
> lsmod | grep dahdi gives
> dahdi_transcode        16384  1 wctc4xxp
> dahdi_voicebus         61440  2 wctdm24xxp,wcte12xp
> dahdi                 225280  11
wctdm24xxp,wcfxo,wctdm,dahdi_transcode,oct612x
> dahdi_voicebus,wcb4xxp,wct1xxp,wct4xxp,wcte11xp,wcte12xp
> crc_ccitt              16384  2 wctdm24xxp,dahdi
>
> There are no cards in the VM - just the CentOS 7.4 operating system.
I'm
> actually running 4.4.92 from elrepo as the kernel.
>
> I am using the confbridge with about 100 devices in the "one way"
> conference and the audio is not intelligible. Sending audio to a single
> endpoint is fine.
>
> dahdi_test running when nothing is happening is 99.8 running with the ALL
> 100 units in conf is about 99.6.
>
> What can I do do get audio where it needs to be ?  I believe the
> environment is VMware.
>
> Thanks,
>
> Jerry
>
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>why load or even install dahdi if no cards are used?
I thought dahdi was needed for a timing source. Doesn't ConfBridge need a
timing source?

Jerry
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On Wed, Jan 24, 2018 at 7:55 PM, Jerry Geis <jerry.geis at gmail.com>
wrote:
> >why load or even install dahdi if no cards are used?
>
> I thought dahdi was needed for a timing source. Doesn't ConfBridge need
a
> timing source?
>
DAHDI is required for MeetMe to do the audio mixing.  ConfBridge does not
need DAHDI since
it does its own mixing in Asterisk.

As for timing sources you have several to choose from of which DAHDI is one
of them.  See
menuselect res_timing_xxx modules.  Timing is really only needed when
playing back sound
prompts when nothing is being received.

Richard
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