How to install asterisk and freepbx in an existing OS

i am using the Asterisknow ISO but i want to use asterisk and freepbx in an already installed ubuntu Os ?
how do i use asterisk in backgorund as a service ? in short i want to install asterisk and freepbx in my ubuntu OS ? i think asterisknow is not recommended for production it is difficult to install in an existing server , so i need your ideas guys … thank you

There is no need for new documentation; nearly everyone who wants to do this succeeds using the existing documentation.

See - wiki.freepbx.org/pages/viewpage. … Id=1409028