Sigma Systems Ltd Ghana
General office
Sigma Systems Ltd
No2 Gaby Avenue, Parakuo
Accra
G/Ag ,KD399
Ghana
Phone: +233 21 408 302
Contact Person
Wisdom Selassie / Project Manager
Phone: +233 21 408 302
Phone: +233 244 560 849
Sigma Systems Ltd
No2 Gaby Avenue, Parakuo
Accra
G/Ag ,KD399
Ghana
Phone: +233 21 408 302
Contact Person
Wisdom Selassie / Project Manager
Phone: +233 21 408 302
Phone: +233 244 560 849
- Internet Telephony Service Provider
- Voip consulting
- IP devices
- PC to Phone
- Cisco Systems
- IP Phone
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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