Not sure if they use the same Flex DSPs as IAD2400 and the AS5xxx, but there was a lot of bugs in the echo cancelers in the earlier loads.. I'd check with TAC on that... We've had issues with a lot of the FlexDSPs and echo problems...
<br><br>I know the newest 12.4(4)T has this resolved... <br><br>You can also fix this with a separate DSP load in the flash when you boot up... <br><br>--<br>Tim<br><br><div><span class="gmail_quote">On 6/2/07, <b class="gmail_sendername">
Jason Aarons (US)</b> <<a href="mailto:jason.aarons@us.didata.com">jason.aarons@us.didata.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
In the past the problem is typically the phone device load, handset<br>volume level, or the DSP/IOS version, not a 2-wire to 4-wire conversion<br>as CCO might lead you to believe...<br><br>Input gain/output attenuation apply to PRIs, 7940/7960 phones have a
<br>tone generator built in and you can measure Echo Return Loss (ERL) to<br>adjust the gain/attenuation.<br><br>I would open a TAC case and check the IOS/DSP firmware version first,<br>there have been a lot of bugs overall.
<br><br>You can request your telco bring out a T-Berd or similar test tool and<br>prove there is no echo at the Smartjack eliminating them.<br><br>-----Original Message-----<br>From: <a href="mailto:cisco-voip-bounces@puck.nether.net">
cisco-voip-bounces@puck.nether.net</a><br>[mailto:<a href="mailto:cisco-voip-bounces@puck.nether.net">cisco-voip-bounces@puck.nether.net</a>] On Behalf Of Linsemier,<br>Matthew<br>Sent: Saturday, June 02, 2007 12:43 PM<br>
To: Erick Bergquist; ciscovoip<br>Subject: Re: [cisco-voip] Echo on IP Phone with PRI (CME)<br><br>In the past any time I had issues with echo such as you describe here,<br>it was handled by adjusting the echo cancel coverage parameters. From
<br>what I understand, input gain and output attenuation commands have no<br>effect on a PRI circuit because it's digital (and those commands are for<br>analog POTS lines).<br><br>I would suspect you are running into an IOS bug, a DSP resource that is
<br>intermittently failing, or receiving echo outside of the maximum<br>coverage area or a telco side issue. I would start with IOS and work up<br>the list from there. You may also want to verify if the echo is lasting<br>
the whole conversation, or just the first few seconds. Remember that<br>sometimes it takes a second for the echo cancel coverage to kick in and<br>it can be noticable to the humar ear. It's gotten much better since<br>
12.4 was released.<br><br>Matt<br><br>________________________________<br><br>From: <a href="mailto:cisco-voip-bounces@puck.nether.net">cisco-voip-bounces@puck.nether.net</a> on behalf of Erick Bergquist<br>Sent: Fri 6/1/2007 11:47 AM
<br>To: ciscovoip<br>Subject: [cisco-voip] Echo on IP Phone with PRI (CME)<br><br><br><br>Hi,<br><br><br><br>I am having issue where users report echo on the IP phones<br>every now and then that lasts the whole call. The echo they hear is
<br>their voice back on the IP Phone. The outside party does not hear echo.<br><br><br><br>The T1 PRI controller is clean, no errors and the router<br>network-clock is set to use the PRI.<br><br>CME is on a 2811 with IOS
12.4(6)XE2<br>, c2800nm-ipvoicek9-mz.124-6.XE2.bin<br><br><br>Have tried different echo cancel coverage settings and input/output gain<br>adjustments. They had no echo for almost a week then had it frequently<br>for 1-2 days and now it is good again for past 2 days.
<br><br>voice-port 0/0/0:23<br><br> input gain -3<br><br> output attenuation 3<br><br> music-threshold -45<br><br><br><br>The phones are 7941s and firmware 8.0(4)SR2 -- is it safe to try latest<br>firmware version on CME without IOS update?
<br><br><br>Any ideas?<br><br><br><br><br>________________________________________________________________________<br>____________<br>Be a better Globetrotter. Get better travel answers from someone who<br>knows. Yahoo! Answers - Check it out.
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