Denphone K.K. Japan

Denphone K.K. is Japan's leading provider of open PC based VOIP Telephone PBX systems. Our PBX and telephony solutions are based on the Asterisk open source telephony architecture, and provide advanced features such as voicemail and conferencing as standard!

Open standards (e.g. SIP and IAX) are fully supported so your investment is protected. Our technology is provided with a wide choice of business telephone equipment, including major names such as Cisco, Polycom and Snom, providing long term future upgrade paths at minimal cost!

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General office

Denphone K.K.
4F #402 Azabu Juban Minato-ku
Tokyo
,106-0045
Japan

Phone: +813 5545 4638
Site: http://www.denphone.com

International VoIP Wholesale Provider
Internet Telephony Service Provider
Voip consulting
Voip Termination ISP

Consultancy Services
Installation and Support Services
Partnering for Origination and Termination
Phone To Phone
Project Mangement Services
SIP VoIP Gateway
Termination
Voice and Video Conferencing

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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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