<div dir="ltr">Um, no, it should be external (unless it is a PTP, then you set one side to external, and the other to internal).<br><br>You need to do a network-clock-select t1 1 [interface of PRI]<br><br>Set it to first preference and the slips will go away... and set it to line clocking.<br>
<br><br><br>Jonathan<br><br><div class="gmail_quote">On Thu, Sep 4, 2008 at 10:15 AM, 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;">
<div style="">Jonathan,<div>Thank you for the reply. Sure enough I have a bunch of slips on both T1's. Clock was set to external on both so I'll try changing that first.</div><div><br></div><font color="#888888"><div>
<br></div><div>-Brian</div></font><div><div></div><div class="Wj3C7c"><div><br><div><div>On Sep 3, 2008, at 5:06 PM, Jonathan Charles wrote:</div><br><blockquote type="cite"><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" target="_blank">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> _______________________________________________<br> cisco-voip mailing list<br>
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