Further clarification sorry.
There are some other things you can do besides echo cancellation to alleviate the echo such as reduce the tx level etc. Have a read of the doco.
Regards
Mike
| Michael Knill/Australia/[EMAIL PROTECTED]
Sent by: [EMAIL PROTECTED] 20/06/2006 10:07 AM
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|
David
I dont know a great deal about setting up Zap cards, not ever owning one, however I do know about echo.
Below is an excellent document from Cisco explaining echo on VoIP. From what I have seen on boards, I think this is one of the most misunderstood subjects.
There is nothing at your end that would cause echo to be received by you (except low quality handsets as metioned). If there were problems at your end then echo would be received by the other party, not you. PS the very long cable you have going to the phone socket is probably quite short in comparison to the length of cable going to the exchange. Its all just twisted pair !!
All that VoIP does to echo is it compounds the problem due to the increased latency. The echo was already there on the analogue phone line, however you would only notice it as louder sidetone in your receiver due to the very low latency.
Echo cancellation is the only option.
http://www.cisco.com/en/US/tech/tk652/tk701/technologies_white_paper09186a00800d6b68.shtml
Mike
| David Caldwell <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED] 19/06/2006 09:53 PM
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|
Hi all,
I think my echo problem might be due to a very long cable run from the TDM cards to the phone socket. I will relocate the Astlinux server and test for echo again.
In the meantime, I've been trying to find a tool called 'ztmonitor' mentioned in a number of articles about echo and gain used for tweaking the Zap cards. Is this included with Astlinux or is there an alternative I can use?
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