[asterisk-users] "scratchy" sound on TE410P

[Russ Meyerriecks]

On 11/11/10 11:06 PM, Carlos Chavez wrote:
> On Thu, 11 Nov 2010 20:08:09 -0600, Russ Meyerriecks wrote
>> On 11/11/10 7:23 PM, Carlos Chavez wrote:
>>
>>> 	I seem to be having the same problem with a new server.  I am using a
>>> TE220 with a VPM450 module.  Using Dahdi 2.4.0 and Asterisk 1.6.2.13 on
>>> a Dell server.  All calls to the outside have bad voice quality (echo
>>> and distortion).  Internal calls between extensions sound fine.
>>>
>>> Dahdi_main for Span 2 (20 days uptime).
>>>
>>> Span 2:
>>>> FEC : 103:
>>>> CEC : 0:
>>>> CVC : 0:
>>>> EBC : 0:
>>>> BEC : 0:
>>>> PRBS: 72:
>>>> GES : 4054:
>>>
>>> Span 2: TE2/0/2 "T2XXP (PCI) Card 0 Span 2" (MASTER) HDB3/CCS
>>> 	Timing slips: 1566
>>
>> With framing errors and slips it could be a timing issue.
>>
>> Let's see your /etc/dahdi/system.conf
>>
>
> Here it is.
> # Span 2: TE2/0/2 "T2XXP (PCI) Card 0 Span 2" (MASTER)
> span=2,1,0,ccs,hdb3

   I have a hunch your Errored Seconds are incrementing due to the 
timing slips. But it looks like you're configured to recover timing from 
the line properly. I'm uncertain as to what could cause this beyond a 
jittery trunk. The framing errors give evidence to support something is 
wrong with the trunk, as well.

   It might be worth getting with your service provider and running some 
loopback tests. You can put your digium card in a network facing 
loopback by using dahdi_maint as such:

dahdi_maint -s 2 --loopback networkline

This will allow your telco to run patterns towards your connection, for 
a while, to determine if there are any errors.

-- 
Russ Meyerriecks
Digium | Linux Kernel Developer