[Asterisk-Users] Asterisk Crackly Bad quality

[Paul Fielding]

I'm interested in this, too.   I find that when I use Xten or SjPhone 
software locally the quality is quite good, but when I use it remotely 
across the internet, I get quite a crackly response.

*however*, if I use some SIP hardware, such as a Grandstream 236 or an IP 
phone (still use alaw just like Xten and SJ), the quality is great, even 
from halfway around the world. Literally.

This leads me to think that the softphones are doing something not as well 
as the hardware SIP devices.  Anyone have any thoughts on that?   I've seen 
this behavior with multiple client computers, so I don't think it's just the 
computer that's using the softphone that's to blame...

Paul

----- Original Message ----- 
From: "Bruno Hertz" <brrhtz at yahoo.de>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at lists.digium.com>
Sent: Saturday, December 18, 2004 4:37 PM
Subject: Re: [Asterisk-Users] Asterisk Crackly Bad quality


> On Sat, 2004-12-18 at 14:55 -0600, Steven Critchfield wrote:
>
>> I highly suggest you work on getting either the RTC or USB driver loaded
>> to provide timing if you don't already have a PSTN card for that job.
>
> OK, this is all softphones and one AVM passive BRI card here, so no
> digium hardware. And frankly, I'd be rather surprised if asterisk,
> apart from the standard kernel rtc timer, needs a special timer just
> to play back the demo voice and send it over the LAN. Remember, it's
> the initial setup we're talking about, and only the demo playback.
>
> To make sure, I compiled and loaded the ztdummy driver (from zaptel
> dir for 2.6 kernel). No difference.
>
> Also, if it really was the timer, that would hardly explain why e.g.
> FC3 and Debian Sarge behave so (wildly) different. I admit though
> that strange things happen sometimes :)
>
> So no, the dummy driver didn't do it.
>
> Thanks for your hints, Bruno.
>
>
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