start tone,end tone and Long tone in E.4 of RFC3015

Tom Taylor <[email protected]>
Newsgroups gmane.ietf.megaco
Message-ID <[email protected]>
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Tom Taylor

From: KD王永胜 <[email protected]>
Date: Tue, 29 Apr 2008 17:18:23 +0800

  Hello

Rfc3015 annex E.4 makes me confused.

What’s the meaning of start tone,end tone and Long tone in E.4?

In my point of view,the start and finish of a call process can be descripted 
with the offhook and onhook signaling.So why use these concept?

Can you tell me how to use these concept?

  For example ,In a call process, where is a start tone appear? Can you give me 
a simple explanation!

Thank you so much in advance!



Kind regards

Johnson




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