asterisk users - Feb 2009 - Packet Truncated - Choppy Audio

Hi there,

We're having some complaints of choppy audio from our SIP customers.  
Asterisk is showing no errors, but I'm getting a lot of these in my syslog:

Feb 17 13:34:31 ntop[2863]:   **WARNING** packet truncated (14654->8232)

The first number varies, but the last number is always 8232.

I've read that this is a common MTU size, but none of our interfaces 
have an MTU of 8232.  Could it be that Asterisk is chopping the 
packets?  Has anyone seen this before?

Any assistance would be most gratefully received.

Regards,

Matt King
Managing Director
Orderly Software Ltd.

This indicates that your NIC card is not handling the throughput
effectively.   Is * the only application on your server?  How many users are
on * when this occurs?

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Matt King
Sent: Tuesday, February 17, 2009 8:58 AM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] Packet Truncated - Choppy Audio

Hi there,

We're having some complaints of choppy audio from our SIP customers.  
Asterisk is showing no errors, but I'm getting a lot of these in my syslog:

Feb 17 13:34:31 ntop[2863]:   **WARNING** packet truncated (14654->8232)

The first number varies, but the last number is always 8232.

I've read that this is a common MTU size, but none of our interfaces 
have an MTU of 8232.  Could it be that Asterisk is chopping the 
packets?  Has anyone seen this before?

Any assistance would be most gratefully received.

Regards,

Matt King
Managing Director
Orderly Software Ltd.

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Hello Danny,

Thank you for the swift reply!

As it turns out, this was an artifact from ntop, which has a default 
maximum buffer size of 8232 bytes.

We're still getting choppy audio, but we've ruled this error message out
  as a possible cause.

Thanks again,

Matt.

From: "Danny Nicholas" <danny at debsinc.com>
Subject: Re: [asterisk-users] Packet Truncated - Choppy Audio

This indicates that your NIC card is not handling the throughput
effectively.   Is * the only application on your server?  How many users are
on * when this occurs?