implement SIP protocol in arm-cortex-m4 FREERTOS - arm

Question

I have been working VOIP software for some time now. I have a 88MW300 (ARM CORTEX M4) micro controller and i was wondering if i could implement SIP Protocol in the controller So that I may be able to use that device as a IP Phone to make and receive calls.
This Controller uses FreeRTOS OS and thus if there is any way to build SIP stacks would also be helpful.
I am very much new to Micro controllers and building firmware into it.So any kind of help will be appreciated.
I Tried using PJSIP source Code to compile in the board. But it is not fully compatible and gives quite a few errors. Reason being PJSIP does not have config for freertos. and also PJSIP is very large compared to the flash memory of the board. I am focusing on reducing the size later but want to successfully built it first.
The basic config file for any os is something like this.
#ifndef __PJ_COMPAT_OS_LINUX_H__
#define __PJ_COMPAT_OS_LINUX_H__
/**
* #file os_linux.h
* #brief Describes Linux operating system specifics.
*/
#define PJ_OS_NAME "linux"
#define PJ_HAS_ARPA_INET_H 1
#define PJ_HAS_ASSERT_H 1
#define PJ_HAS_CTYPE_H 1
#define PJ_HAS_ERRNO_H 1
#define PJ_HAS_LINUX_SOCKET_H 0
#define PJ_HAS_MALLOC_H 1
#define PJ_HAS_NETDB_H 1
#define PJ_HAS_NETINET_IN_H 1
#define PJ_HAS_SETJMP_H 1
#define PJ_HAS_STDARG_H 1
#define PJ_HAS_STDDEF_H 1
#define PJ_HAS_STDIO_H 1
#define PJ_HAS_STDLIB_H 1
#define PJ_HAS_STRING_H 1
#define PJ_HAS_SYS_IOCTL_H 1
#define PJ_HAS_SYS_SELECT_H 1
#define PJ_HAS_SYS_SOCKET_H 1
#define PJ_HAS_SYS_TIME_H 1
#define PJ_HAS_SYS_TIMEB_H 1
#define PJ_HAS_SYS_TYPES_H 1
#define PJ_HAS_TIME_H 1
#define PJ_HAS_UNISTD_H 1
#define PJ_HAS_SEMAPHORE_H 1
#define PJ_HAS_MSWSOCK_H 0
#define PJ_HAS_WINSOCK_H 0
#define PJ_HAS_WINSOCK2_H 0
#define PJ_HAS_LOCALTIME_R 1
#define PJ_SOCK_HAS_INET_ATON 1
/* Set 1 if native sockaddr_in has sin_len member.
* Default: 0
*/
#define PJ_SOCKADDR_HAS_LEN 0
/**
* If this macro is set, it tells select I/O Queue that select() needs to
* be given correct value of nfds (i.e. largest fd + 1). This requires
* select ioqueue to re-scan the descriptors on each registration and
* unregistration.
* If this macro is not set, then ioqueue will always give FD_SETSIZE for
* nfds argument when calling select().
*
* Default: 0
*/
#define PJ_SELECT_NEEDS_NFDS 0
/* Is errno a good way to retrieve OS errors?
*/
#define PJ_HAS_ERRNO_VAR 1
/* When this macro is set, getsockopt(SOL_SOCKET, SO_ERROR) will return
* the status of non-blocking connect() operation.
*/
#define PJ_HAS_SO_ERROR 1
/* This value specifies the value set in errno by the OS when a non-blocking
* socket recv() can not return immediate daata.
*/
#define PJ_BLOCKING_ERROR_VAL EAGAIN
/* This value specifies the value set in errno by the OS when a non-blocking
* socket connect() can not get connected immediately.
*/
#define PJ_BLOCKING_CONNECT_ERROR_VAL EINPROGRESS
/* Default threading is enabled, unless it's overridden. */
#ifndef PJ_HAS_THREADS
# define PJ_HAS_THREADS (1)
#endif
#define PJ_HAS_HIGH_RES_TIMER 1
#define PJ_HAS_MALLOC 1
#ifndef PJ_OS_HAS_CHECK_STACK
# define PJ_OS_HAS_CHECK_STACK 0
#endif
#define PJ_NATIVE_STRING_IS_UNICODE 0
#define PJ_ATOMIC_VALUE_TYPE long
/* If 1, use Read/Write mutex emulation for platforms that don't support it */
#define PJ_EMULATE_RWMUTEX 0
/* If 1, pj_thread_create() should enforce the stack size when creating
* threads.
* Default: 0 (let OS decide the thread's stack size).
*/
#define PJ_THREAD_SET_STACK_SIZE 0
/* If 1, pj_thread_create() should allocate stack from the pool supplied.
* Default: 0 (let OS allocate memory for thread's stack).
*/
#define PJ_THREAD_ALLOCATE_STACK 0
/* Linux has socklen_t */
#define PJ_HAS_SOCKLEN_T 1
#endif /* __PJ_COMPAT_OS_LINUX_H__ */
Again i am a little blurry as to what parameters should i put for FREERTOS.
Another error i get is in error generation.
the Error generation file (errorno.h) is given as.
#ifndef __PJ_COMPAT_ERRNO_H__
#define __PJ_COMPAT_ERRNO_H__
#if defined(PJ_WIN32) && PJ_WIN32 != 0 || \
defined(PJ_WIN32_WINCE) && PJ_WIN32_WINCE != 0 || \
defined(PJ_WIN64) && PJ_WIN64 != 0
typedef unsigned long pj_os_err_type;
# define pj_get_native_os_error() GetLastError()
# define pj_get_native_netos_error() WSAGetLastError()
#elif defined(PJ_HAS_ERRNO_VAR) && PJ_HAS_ERRNO_VAR!= 0
typedef int pj_os_err_type;
# define pj_get_native_os_error() (errno)
# define pj_get_native_netos_error() (errno)
#else
# error "Please define how to get errno for this platform here!"
#endif
#endif /* __PJ_COMPAT_ERRNO_H__ */
I have no idea what parameters do i add for my platform.
These are the few errors i get while compiling, After that i think i will succesfully build it.
Any kind of help will be helpful.
Thank you