Hello again, The reason I ask is because I am trying to port FS to OSv. Unfortunately, Fork ( ) is unsupported in OSv. Regards, Abdul Hakeem From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Moises Silva Sent: Tuesday, January 13, 2015 5:11 PM To: FreeSWITCH Users Help Subject: Re: [Freeswitch-users] Fork( ) and Exec ( ) functions On Tue, Jan 13, 2015 at 8:11 AM, Abdul Hakeem <alhakeem@gmail.com> wrote: Hello, I understand FS makes system calls for sending mails, voicemail and fax. Can anyone guide me on how to mitigate the load of fork ( ) and exec( ) on system calls & also, a list of functions which require FS to make system calls ? Not making much sense here. Everything in FS relies heavily on system calls as it's a multi-threaded-I/O-driven system for the most part. I think you're asking the wrong question.