----- Original Message -----
From: "Jeff Busch" <[EMAIL PROTECTED]>
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
[EMAIL PROTECTED] 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.
Does anyone have any suggestions on troubleshooting / fixing this
problem?
Hi Jeff,
I recommend upgrading to [EMAIL PROTECTED] 2.0 which was just released.
It uses Asterisk 1.2 and a 2.6.9 based kernel which handles i/o and
interrupts much better.
While the link below discusses issues with digium cards, in general
the interrupts and IDE vs SATA drive discussions are of use no matter
what.
http://www.asteriskguru.com/tutorials/pci_irq_apic_tdm_ticks_te410p_te405p_noise.html
I have 2 Digium T400P cards connected to 8 POTS lines and
10 sipura spa-841 phones.
I went through two PCs we had (2.9 GHZ celeron, 2.1HGZ Athlon
XP) both with IDE drives. I finally declared war on echo and
the Rice Krispies syndrome (Snap, Crackle, Pop) on the internal
end of the conversations.
I went and bought an ASUS P5LD2 motherboard with 1GB
memory, 3.2GHz P4 with hyperthreading and a 2MB cache,
and a SATA drive. I installed [EMAIL PROTECTED] 2.0. After some
minor magic to get the correct merlin gigabit ethernet driver for
CentOS 4.2, everything came up perfect.
This was my thanksgiving project and so far sound quality has been
perfect. No echo and no rice krispies.
I simulated network load on the system by copying multi-GBs of files
through the net from another server with scp while I called out and
back into the system on multiple lines. Even with the scp reporting
9.5MB/sec, the phone sound quality was fantastic.
I then upped the ante by copying multi-gb files on the hard drive which
when viewing stats with top (hyperthreading shows as 2 CPUs and
you run the SMP kernel) both CPUs showed no idle time. IO- Wait
state never greater than 10%. Phone calls were still perfect with no echo
or noise. Out of the 10 vmails I left as part of the test, only one had
3 very faint pops in a 30 second message. They could have come from
the POTS line for all I know.
I ran extended phone conversations by calling the Asterisk system from
our old phone system, picking up the extension on the called SIP phone
and then playing Law & Order
dvd episodes (lots of talking) and placing the handset near to the speaker
and taking the old phone system handset and listening and talking back
into it for 30 minutes at a time. Necessity is indeed a mother.... ;-)
The calls were perfect. I'm amazed at how clear the dvd audio came
through.
I then reversed the process and played the dvd audio through the
Asterisk system handsets while listening and talking back through the
old phone handsets.
After 30 minutes the quality was still excellent.
Hope you find some of this ramble useful.
Mike
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