[Asterisk-Users] Static on inside end of conversation

[Damian Funnell]

We had a similar problem a while back and found that it was being caused by
Hyperthreading.  If you are using analogue cards then unfortunately you 
need to
disable H/T if you haven't already done so.

You also need to confirm that your fxo/fxs card isn't sharing IRQ's with
anything.  Don't trust 'cat /proc/interrupts', use 'lspci -v' instead.

Also got this advice from Digium, although it has never applied to us:

>>> If you are running an IDE hard drive please verify that you are using
>>> DMA mode with a UDMA setting of no lower than 2 or higher than 3.  UDMA
>>> mode 2 is ATA33.  UDMA mode 3 is ATA44.  This can be done using hdparm.
>>> We suggest using "hdparm -d 1 -X udma2 -c 3 /dev/[IDE Device]".  You
>>> can check the status using "hdparm /dev/[IDE Device]" and "hdparm -i
>>> /dev/[IDE Device]".  If you make modifications to your IDE hard drive
>>> settings they will only be kept until you reboot.
>
> Not sure if this is what is causing your issues or not, but hopefully it will
> help if it is.
>
> Cheers,
> Damian Funnell.
>
> FFF Managed Technology Ltd.
> 60 Cook St
> P.O. 6368 Wellesley St
> Auckland
> t +64 9 356 2911
> f +64 9 358 9070
> m +64 21 415 297
> w www.fff.co.nz
>
>
>
> Quoting Health Masters <techsupport at progressivehomehealth.com>:
>
>> We have the same problem lately we thought maybe our upgrade and 
>> testing of the .13 firmware.. but we are running 20 phones on a  p4 
>> 2.6 w/512 4 PSTN lines on TDM400P and have 3 fat client pc's and 7 
>> pcexpanions ( http://ncomputing.com/ ) running to a fat client. We 
>> did not have the issue on firmware .09 or .12. What firmware are you 
>> using?
>>
>> Jeff Busch wrote:
>>
>>> This definitely could be the issue.  I am running 15 total devices (7
>>> IP500 phones and 7 PC's along with a networked fax/scanner, and the
>>> Asterisk Server) through a single 16 port switch.  We run one MS 
>>> Access app on almost all the desktops that is a
>>> client/server app that creates a lot of traffic.  I will go to the site
>>> tomorrow and make some changes to the topology of the LAN.
>>>
>>> Thanks!
>>>
>>> Jeff
>>>
>>> -----Original Message-----
>>> From: asterisk-users-bounces at lists.digium.com
>>> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Steve
>>> Blair
>>> Sent: Tuesday, November 29, 2005 4:33 PM
>>> To: Asterisk Users Mailing List - Non-Commercial Discussion
>>> Subject: Re: [Asterisk-Users] Static on inside end of conversation
>>>
>>>
>>>
>>> Jeff Busch wrote:
>>>
>>>
>>>> You are correct.  Inside means the IP Network and Outside means 
>>>> the PSTN accessible via the Audiocodes MP-108 gateway.
>>>>
>>>> No QoS.
>>>>
>>>>
>>>>
>>>>
>>> We've seen echo on congested LANs within our Enterprise. I'm not sure if
>>> this fits what your seeing or not. We've placed phones in their own vlan
>>> and added 802.1p QoS to expedite forwarding upto the first hop router
>>> for the outbound call leg and the echo is gone. We did the same for the
>>> inbound call leg also.
>>>
>>>
>>>> Thanks - Jeff
>>>>
>>>> -----Original Message-----
>>>> From: asterisk-users-bounces at lists.digium.com
>>>> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Steve Blair
>>>> Sent: Tuesday, November 29, 2005 4:20 PM
>>>> To: Asterisk Users Mailing List - Non-Commercial Discussion
>>>> Subject: Re: [Asterisk-Users] Static on inside end of conversation
>>>>
>>>>
>>>>
>>>> Jeff Busch wrote:
>>>>
>>>>
>>>>
>>>>
>>>>> Hello,
>>>>>
>>>>> I am running the following configuration:
>>>>>
>>>>> 2.8ghz P4 with 1GB of RAM
>>>>> Audiocodes MP-108 connected to 5 POTS lines Polycom IP-500 phones 
>>>>> Asterisk at Home 1.3 (this is Asterisk 1.0.9)
>>>>>
>>>>> End users are complaining of an echo and static on the inside end (the
>>>>>
>>>
>>>
>>>>> internal side), but the outside end of the conversation doeesn't notice
>>>>>
>>>>
>>>>
>>>>
>>>>> anything.
>>>>>
>>>>>
>>>>>
>>>>>
>>>> I'm assuming inside means on the IP network and outside means on 
>>>> the PSTN which is accessible via a gateway is this correct? If so 
>>>> do you have QoS enabled on the inside?
>>>>
>>>>
>>>>
>>>>
>>>>> Does anyone have any suggestions on troubleshooting / fixing this 
>>>>> problem?
>>>>>
>>>>> Thanks!
>>>>>
>>>>> Jeff
>>>>>
>>>>>
>>>>>
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>>>>>
>>>>>
>>>>>
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>>
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