asterisk users - Feb 2004 - Noise and scratches when there are two concurrent CAPI calls

Hi,

When I have two concurrent CAPI calls, * produces a lot of noises and
scratches on both CAPI channels.

I am using SIP phones; it appears on all phones, even if two separate SIP
devices are connected to the two CAPI channels.

The problem does not appear with any number of concurrent calls using SIP
end-to-end (with * as a media gateway).

I am using FritzCard! DSL (the ISDN part of it) and kernel 2.4.24 vanilla.

Any help is appreciated.

Costa

Hello Everyone..

I have successfully setup an Asterisk PBX here. Also, I do have it interface
with our existing PBX system which is the Avaya Definity. I'm now on the
process of migrating all our system setup, from Avaya to Asterisk and in
this case, the ACD functionality. Below is the ACD script of our Avaya PBX.
As you could see, I queue a certain skill/hunt group, then caller hears
music for a specific period of time, example 60 seconds wait time, then
after which, caller would hear a playback announcement telling him to stay
on hold, then wait time again, then an option to leave a message on a
mailbox, and so and so forth. I won't ask if this is possible with Asterisk
cause I know Asterisk can do all the modern PBX functionalities..Just wonder
if someone have already implement this and hoping you could share to me your
scripts..

Thank in advance for the help...

Regards  :-)

Joelson


                                  CALL VECTOR

    Number: 32               Name: Ispbrand ISP

     Basic? y   EAS? y   G3V4 Enhanced? y   ANI/II-Digits? y   ASAI Routing?
n
 Prompting? y   LAI? n  G3V4 Adv Route? y   CINFO? y   BSR? y   Holidays? y

01 wait-time    2   secs hearing ringback
02 announcement 5405
03 queue-to     skill 12  pri t
04 wait-time    60  secs hearing music
05 announcement 5422
06 wait-time    60  secs hearing music
07 check        skill 91  pri t if unconditionally
08 wait-time    60  secs hearing music
09 check        skill 90  pri t if unconditionally
10 collect      1    digits after announcement 5406
11 route-to     number 1308             with cov y if digit           =  1
12 wait-time    120 secs hearing music
13 announcement 5417
14 wait-time    120 secs hearing music
15 announcement 5403
16 wait-time    3   mins hearing music
17 announcement 5404
18 wait-time    3   mins hearing music
19 announcement 5404
20 wait-time    3   mins hearing music
21 messaging    skill 99  for extension 1308
22 stop

Hi,

Are there any well known good H/W configurations for high density E1
setups supporting * and FAX? The response we got from digium about their
cards, as far as FAX is concerned, is: "I would not depend upon them for
FAX. It does work, but it is not completely reliable.".

The minimum we would need is 4 x E1 on each system but both Voice and FAX
at the same time.

Also, I saw somewhere on the asterisk sites, that * can support up to 100
concurrent calls on a dual Xeon 1.8GHz when doing media conversion.

We have a few projects that we will need PRI <-> GSM or G729 media
conversion (for WAN use). Do you know any cards that can take care of the
media conversion and free the CPUs (for use with * of course)?

Kind regards,

Costa

Hi all,

Here are some additional info & findings:

My system is dual PIII 933MHz, with a Gigabyte GA-6VXDC7 mobo.
Asterisk produces noises and scratches when the system is IDLE and
*BOTH* CAPI channels are active (with one CAPI channel everything is
fine always).
When the system is busy (CPUs at 100%), sound is perfect with *BOTH*
CAPI channels active.

Here is how I can reproduce the problem:

If I keep one of my CPUs busy while both CAPI channels are active, the
noises stop. Just a scratch here and there.
I keep the CPU busy with this:

# while [ 1 = 1 ]; do echo " " >/dev/null; done

If I run this twice (to keep busy both CPUs), then the noises appear
just every a few seconds.

I can reproduce this every single time.

Note that I have a TDM40B (4xFXS) Digium card installed that is supposed
to provide a high resolution timer to asterisk. The effect is the same
with this card enabled and disabled.

I know the easy workaround: Run setiathome permanently :-)
However, it seems that chan_capi has some timing problems...

Any help?

Costa

On ???, 2004-02-11 at 14:08, Costa Tsaousis wrote:
> Hi,
> 
> When I have two concurrent CAPI calls, * produces a lot of noises and
> scratches on both CAPI channels.
> 
> I am using SIP phones; it appears on all phones, even if two separate SIP
> devices are connected to the two CAPI channels.
> 
> The problem does not appear with any number of concurrent calls using SIP
> end-to-end (with * as a media gateway).
> 
> I am using FritzCard! DSL (the ISDN part of it) and kernel 2.4.24 vanilla.
> 
> Any help is appreciated.
> 
> Costa
>