![]() Implemented noise suppressors (NPP7 and SPEEX) of environment sounds and automatic mic gain control. Some of them are free, some require a license (check regional laws). OPH can use a wide range of in-build voice codec (C source is included) from ultra low-bitrates up to high quality. OPH provides Perfect Forward Secrecy (uses a fresh key for each call) and Full Deniability for using long-term public keys of participants (as a fact and a content of the conversation): like a deniable SKEME protocol uses for initial key exchange.
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