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Method and apparatus for suppressing echo cancelling in a packet switched network
 
   
Document Number
US Patent 7583621
Issued Date
September 1, 2009
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Abstract
A method, or corresponding apparatus, assumes a call is a Voice Band Data (VBD) call. The method disables a local echo canceller and transmits a tone that disables distal echo canceller(s) along a communications path across which the call is communicated. After disabling the echo cancellers, the echo cancellers are allowed to operate in a typical manner, such as according to ITU standards, after the call is established, including remaining disabled if the call is a Voice Band Data call and being automatically enabled if the call is or becomes a voice call. The method or apparatus is particularly useful in networks having Point of Service (POS) devices that have modems that do not send out a 2100 Hz tone to disable echo cancelling in the communications path. In one embodiment, the method or corresponding apparatus is deployed in a gateway.
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Number of Claims:
28
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Owner
Cisco Technology, Inc. (San Jose, CA)
Published
September 1, 2009
Application Number
10/958,751
Filed
October 5, 2004
US Classification
370/286  
Int'l Classification
H04B   3/20   (20060101)  
Examiner
USPTO Field of Search
370/286  
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