Whoch Software & Technologies Ltd China

we are selling a cheap and low rate interntional card, users can achieve phone to pc function and free calls ,welcome to contact us.

we are the voip supplier and we are devote to offer better service to every user.
There is a very good chance that you have been using VoIP for some time now. That’s because Telecoms figured out a while ago that VoIP can help streamline the routing of 1000′s of phone calls. But more and more lately, voice over IP is making headway in businesses and homes as a great alternative to regular phone services. VoIP is often termed an ‘international calling service‘ but the fact is it is often used to make local calls

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General office

Whoch Software & Technologies Ltd
Nishan road Nanshan district
Shenzhen
Guangdong ,518000
China

Phone: +86 755 - 8620 4320
Site: http://www.wholeswitch.com/

Contact Person

jack ao / Sales Manager
Phone: +15900177055

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VPMADT032 echo cancellation module is meant to be used with the Digium IP telephony boards; it provides echo cancellation for configurable long "tail" of up to 128 ms (1024 samples) simultaneously for all ports of the board. All IP-PBX Asterisk servers, connected to the telephone network (PSTN) have one common problem, which is "hybrid echo" - echo obtained due to the difference in the load-wire and four-wire telephone circuits. Echo appears as a distorted reflection and a detainee of the caller's voice, who is subscribed to IP-PBX Asterisk while talking to PSTN subscribers.

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