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<div><span class="gmail_quote">On 5/10/07, <b class="gmail_sendername">Matthew Melbourne</b> <<a href="mailto:matt@melbourne.org.uk">matt@melbourne.org.uk</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Thanks Steve. We have an upgrade planned for our voice gateways in an<br>forthcoming maintenance window, where we'll try
12.4(latest) mainline.<br>Are you aware of any bugs which document this issue?<br><br>Cheers,<br><br>Matt<br><br>On 09/05/07, Steve G <<a href="mailto:smgustafson@gmail.com">smgustafson@gmail.com</a>> wrote:<br>>
12.3(14) will deffinietly give you echo issues. it is the DSP firmware.<br>> either get new DSP firmware from TAC, or upgrade IOS. I am using 12.4(8)b<br>> with no issues.<br>><br>> Steve<br>><br>><br>
> On 4/18/07, Matthew Melbourne <<a href="mailto:matt@melbourne.org.uk">matt@melbourne.org.uk</a>> wrote:<br>> ><br>> > We are getting sporadic issues from users on IP phones who are hearing<br>> > echo on external calls. From this document is would suggest that echo
<br>> > on IP Phones is caused by hybrid echo and not any local acoustic echo.<br>> ><br>> ><br>> <a href="http://www.cisco.com/warp/public/788/voice-qos/echo_ipphone_gateway.html">http://www.cisco.com/warp/public/788/voice-qos/echo_ipphone_gateway.html
</a><br>> ><br>> > The MGCP-controlled voice gateways are all running 12.3(14)T7 with DSP<br>> > firmware 4.4.708. In CallManager (4.1(3)SR2), echo cancellation is on<br>> > for each port, with a "default" echo cancellation coverage of 64ms.
<br>> > Input gain and output attenuation are set to 0dB.<br>> ><br>> > I have seen suggestions to include the "echo-cancel erl worst-case 3"<br>> > command on the voice ports. Can this help in situations of occasional
<br>> > echo?<br>> ><br>> > Are there any other parameters changes which could help? Could it be a<br>> > code/DSP firmware issue? I haven't found a specific echo-related bug<br>> > relating to this particular IOS and its embedded DSP firmware.
<br>> ><br>> > On occasions, the start of the call is fine but echo comes and goes<br>> > during the call.<br>> ><br>> > Is there a quick way of finding out which voice gateway a call is<br>> > terminated on (we have 8, and all could be used in a round-robin
<br>> > fashion for outbound calls).<br>> ><br>> > Cheers,<br>> ><br>> > Matt<br>> ><br>> > --<br>> > Matthew Melbourne<br>> > _______________________________________________
<br>> > cisco-voip mailing list<br>> > <a href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a><br>> > <a href="https://puck.nether.net/mailman/listinfo/cisco-voip">https://puck.nether.net/mailman/listinfo/cisco-voip
</a><br>> ><br>><br>><br><br><br>--<br>Matthew Melbourne<br></blockquote></div><br>