asterisk users - May 2003 - Sound Quality

Hi All,

I've just setup a test Asterisk system that allows incoming/outgoing calls
via
an ISDN card (l4i) and incoming/outgoing calls via SIP (iconnecthere). I have 
two SIP Softphones (Xten X-Lite) for making and receiving calls. 

When receiving an incoming call via the ISDN interface the sound quality is
fine for the Softphone user (i can hear the caller perfectly), but the person 
calling experiences very choppy sound. There are no breaks in the sound, but 
it is very choppy, to the point where a conversation is not possible.

I installed Asterisk from CVS earlier this week. It is running on RedHat 9, 
with a XP1600+ Processor, 384MB RAM. The ISDN card is an 'Elsa Microlink 
ISDN PCI'.

I've searched through the archives but cannot find a resolution to the 
problem. I've tried changing the compression used but this has little or no 
effect. Has anyone got any hints or tips? 

Thanks,
Nathan.

Hi Nathan,

We had the same with the Xten softphone. We're currently trying the Pingtel
client and the quality is first-class. Shame, as the Xten app is much nicer
looking and easier for the user.

Simon

----- Original Message ----- 
From: <nathan@yorkukhosting.com>
To: <asterisk-users@lists.digium.com>
Sent: Sunday, May 11, 2003 12:15 PM
Subject: [Asterisk-Users] Sound Quality

> Hi All,
>
> I've just setup a test Asterisk system that allows incoming/outgoing
calls
via
> an ISDN card (l4i) and incoming/outgoing calls via SIP (iconnecthere). I
have
> two SIP Softphones (Xten X-Lite) for making and receiving calls.
>
> When receiving an incoming call via the ISDN interface the sound quality
is
> fine for the Softphone user (i can hear the caller perfectly), but the
person
> calling experiences very choppy sound. There are no breaks in the sound,
but
> it is very choppy, to the point where a conversation is not possible.
>
> I installed Asterisk from CVS earlier this week. It is running on RedHat
9,
> with a XP1600+ Processor, 384MB RAM. The ISDN card is an 'Elsa
Microlink
> ISDN PCI'.
>
> I've searched through the archives but cannot find a resolution to the
> problem. I've tried changing the compression used but this has little
or
no
> effect. Has anyone got any hints or tips?
>
> Thanks,
> Nathan.
>
>
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
>

I installed Asterisk from CVS earlier this week. It is running on
RedHat
>9, 
>with a XP1600+ Processor, 384MB RAM. The ISDN card is an 'Elsa Microlink
>ISDN PCI'.
>

IIRC from conversations on IRC there are issues with RedHat 9 ...

You could try 8 and see if that solves your problems

Andy

Your choppy sound is most likely caused by the use of the GSM codec.. The GSM
codec seems a little picky about which IP Phones it is going to interoperate
with.. I have still not been able to get it to work at all well with any of the
softphones I have tried or my Snom 200's..

Best bet is to use the G.711 codec (aLAW or uLAW)..

I have been running RedHat 9 with Asterisk for over a month and its been fine so
its not likely to be an OS issue (I had the same bad sound using the GSM codec
with RH7.3 and RH8)..

> Hi All,
> 
> I've just setup a test Asterisk system that allows incoming/outgoing
calls via
> an ISDN card (l4i) and incoming/outgoing calls via SIP (iconnecthere). I
have
> two SIP Softphones (Xten X-Lite) for making and receiving calls. 
> 
> When receiving an incoming call via the ISDN interface the sound quality is
> fine for the Softphone user (i can hear the caller perfectly), but the
person
> calling experiences very choppy sound. There are no breaks in the sound,
but
> it is very choppy, to the point where a conversation is not possible.
> 
> I installed Asterisk from CVS earlier this week. It is running on RedHat 9,
> with a XP1600+ Processor, 384MB RAM. The ISDN card is an 'Elsa
Microlink
> ISDN PCI'.
> 
> I've searched through the archives but cannot find a resolution to the 
> problem. I've tried changing the compression used but this has little
or no
> effect. Has anyone got any hints or tips? 
> 
> Thanks,
> Nathan.
> 
> 
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
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