Audio effects-SIPek is no effect like noise reduction?

[lucho...@gmail.com]

I am currently studying SIPek to realize my soft phone requirements, and I need the function of noise reduction, such as ACE. However, when I read the code, I did not find any code related to this requirement. May I ask if SIPek has realized this function?

• Please tell me which CLASS this function in if you don't mind！