<div dir="ltr">Echo is a function of the analog 2-wire to 4-wire conversion in the hybrid transformer at the central office.<br><br>IOW, it doesn't happen on PRIs.<br><br>In all likelihood, the echo is actually coming from the other side... <br>
<br>However, check your T1 for slips, since you already have the echo cancellers are maxed out...<br><br>You can also try this:<br><br>voice-card 1<br> codec complexity medium ecan-extended<br><br>However, I don't think you can do that with a PRI already configured...<br>
<br>What are the input gain and output attenuation?<br><br><br><br>Jonathan<br><br><div class="gmail_quote">On Wed, Sep 3, 2008 at 4:07 PM, Brian Lehigh <span dir="ltr"><<a href="mailto:brianl@sti.net">brianl@sti.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hello all,<br>
We have a 2811 with a VWIC2-2MFT-T1/E1 running MGCP with two PRI to the PSTN. The 2811 is running 12.4(13r)T. We're running Call Manager <a href="http://6.1.2." target="_blank">6.1.2.</a><br>
Some end users are complaining of echo when placing calls to the PSTN. All users have either 7941 or 7961 phones. SW Echo cancellation is enabled on both PRI with a 64ms Echo Cancellation Coverage. We have tweaked QoS, etc. and just can't seem to reduce it.<br>
Is there anything else we can do to suppress some of this echo, short of buying the hardware expansion module?<br>
<br>
Thanks,<br>
<br>
-Brian<br>
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