diff --git a/configure b/configure
index b081e23ab4b397159c4fd76d037995a1b8b5c76e..863b79bd5d16593aa54180397b9a763efd3d1f59 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac Revision: 89351 .
+# From configure.ac Revision: 89354 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61.
 #
@@ -10057,6 +10057,148 @@ fi
 done
 
 
+
+
+for ac_header in winsock.h winsock2.h
+do
+as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
+if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
+  { echo "$as_me:$LINENO: checking for $ac_header" >&5
+echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6; }
+if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+fi
+ac_res=`eval echo '${'$as_ac_Header'}'`
+	       { echo "$as_me:$LINENO: result: $ac_res" >&5
+echo "${ECHO_T}$ac_res" >&6; }
+else
+  # Is the header compilable?
+{ echo "$as_me:$LINENO: checking $ac_header usability" >&5
+echo $ECHO_N "checking $ac_header usability... $ECHO_C" >&6; }
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+#include <$ac_header>
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_compile") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest.$ac_objext; then
+  ac_header_compiler=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_header_compiler=no
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+{ echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
+echo "${ECHO_T}$ac_header_compiler" >&6; }
+
+# Is the header present?
+{ echo "$as_me:$LINENO: checking $ac_header presence" >&5
+echo $ECHO_N "checking $ac_header presence... $ECHO_C" >&6; }
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <$ac_header>
+_ACEOF
+if { (ac_try="$ac_cpp conftest.$ac_ext"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_cpp conftest.$ac_ext") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } >/dev/null && {
+	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       }; then
+  ac_header_preproc=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+  ac_header_preproc=no
+fi
+
+rm -f conftest.err conftest.$ac_ext
+{ echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
+echo "${ECHO_T}$ac_header_preproc" >&6; }
+
+# So?  What about this header?
+case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
+  yes:no: )
+    { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
+echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the compiler's result" >&5
+echo "$as_me: WARNING: $ac_header: proceeding with the compiler's result" >&2;}
+    ac_header_preproc=yes
+    ;;
+  no:yes:* )
+    { echo "$as_me:$LINENO: WARNING: $ac_header: present but cannot be compiled" >&5
+echo "$as_me: WARNING: $ac_header: present but cannot be compiled" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header:     check for missing prerequisite headers?" >&5
+echo "$as_me: WARNING: $ac_header:     check for missing prerequisite headers?" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: see the Autoconf documentation" >&5
+echo "$as_me: WARNING: $ac_header: see the Autoconf documentation" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&5
+echo "$as_me: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the preprocessor's result" >&5
+echo "$as_me: WARNING: $ac_header: proceeding with the preprocessor's result" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: in the future, the compiler will take precedence" >&5
+echo "$as_me: WARNING: $ac_header: in the future, the compiler will take precedence" >&2;}
+
+    ;;
+esac
+{ echo "$as_me:$LINENO: checking for $ac_header" >&5
+echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6; }
+if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  eval "$as_ac_Header=\$ac_header_preproc"
+fi
+ac_res=`eval echo '${'$as_ac_Header'}'`
+	       { echo "$as_me:$LINENO: result: $ac_res" >&5
+echo "${ECHO_T}$ac_res" >&6; }
+
+fi
+if test `eval echo '${'$as_ac_Header'}'` = yes; then
+  cat >>confdefs.h <<_ACEOF
+#define `echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
+
 # Check whether --enable-largefile was given.
 if test "${enable_largefile+set}" = set; then
   enableval=$enable_largefile;
@@ -15140,18 +15282,112 @@ _ACEOF
 fi
 done
 
-if test "${ac_cv_header_poll_h+set}" = set; then
-  { echo "$as_me:$LINENO: checking for poll.h" >&5
-echo $ECHO_N "checking for poll.h... $ECHO_C" >&6; }
-if test "${ac_cv_header_poll_h+set}" = set; then
+
+for ac_func in timersub
+do
+as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
+{ echo "$as_me:$LINENO: checking for $ac_func" >&5
+echo $ECHO_N "checking for $ac_func... $ECHO_C" >&6; }
+if { as_var=$as_ac_var; eval "test \"\${$as_var+set}\" = set"; }; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+/* Define $ac_func to an innocuous variant, in case <limits.h> declares $ac_func.
+   For example, HP-UX 11i <limits.h> declares gettimeofday.  */
+#define $ac_func innocuous_$ac_func
+
+/* System header to define __stub macros and hopefully few prototypes,
+    which can conflict with char $ac_func (); below.
+    Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+    <limits.h> exists even on freestanding compilers.  */
+
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+
+#undef $ac_func
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char $ac_func ();
+/* The GNU C library defines this for functions which it implements
+    to always fail with ENOSYS.  Some functions are actually named
+    something starting with __ and the normal name is an alias.  */
+#if defined __stub_$ac_func || defined __stub___$ac_func
+choke me
+#endif
+
+int
+main ()
+{
+return $ac_func ();
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext &&
+       $as_test_x conftest$ac_exeext; then
+  eval "$as_ac_var=yes"
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	eval "$as_ac_var=no"
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext conftest.$ac_ext
+fi
+ac_res=`eval echo '${'$as_ac_var'}'`
+	       { echo "$as_me:$LINENO: result: $ac_res" >&5
+echo "${ECHO_T}$ac_res" >&6; }
+if test `eval echo '${'$as_ac_var'}'` = yes; then
+  cat >>confdefs.h <<_ACEOF
+#define `echo "HAVE_$ac_func" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+done
+
+if test "${ac_cv_header_sys_poll_h+set}" = set; then
+  { echo "$as_me:$LINENO: checking for sys/poll.h" >&5
+echo $ECHO_N "checking for sys/poll.h... $ECHO_C" >&6; }
+if test "${ac_cv_header_sys_poll_h+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 fi
-{ echo "$as_me:$LINENO: result: $ac_cv_header_poll_h" >&5
-echo "${ECHO_T}$ac_cv_header_poll_h" >&6; }
+{ echo "$as_me:$LINENO: result: $ac_cv_header_sys_poll_h" >&5
+echo "${ECHO_T}$ac_cv_header_sys_poll_h" >&6; }
 else
   # Is the header compilable?
-{ echo "$as_me:$LINENO: checking poll.h usability" >&5
-echo $ECHO_N "checking poll.h usability... $ECHO_C" >&6; }
+{ echo "$as_me:$LINENO: checking sys/poll.h usability" >&5
+echo $ECHO_N "checking sys/poll.h usability... $ECHO_C" >&6; }
 cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
 _ACEOF
@@ -15159,7 +15395,7 @@ cat confdefs.h >>conftest.$ac_ext
 cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
 $ac_includes_default
-#include <poll.h>
+#include <sys/poll.h>
 _ACEOF
 rm -f conftest.$ac_objext
 if { (ac_try="$ac_compile"
@@ -15191,15 +15427,15 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 echo "${ECHO_T}$ac_header_compiler" >&6; }
 
 # Is the header present?
-{ echo "$as_me:$LINENO: checking poll.h presence" >&5
-echo $ECHO_N "checking poll.h presence... $ECHO_C" >&6; }
+{ echo "$as_me:$LINENO: checking sys/poll.h presence" >&5
+echo $ECHO_N "checking sys/poll.h presence... $ECHO_C" >&6; }
 cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
 _ACEOF
 cat confdefs.h >>conftest.$ac_ext
 cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
-#include <poll.h>
+#include <sys/poll.h>
 _ACEOF
 if { (ac_try="$ac_cpp conftest.$ac_ext"
 case "(($ac_try" in
@@ -15232,40 +15468,40 @@ echo "${ECHO_T}$ac_header_preproc" >&6; }
 # So?  What about this header?
 case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
   yes:no: )
-    { echo "$as_me:$LINENO: WARNING: poll.h: accepted by the compiler, rejected by the preprocessor!" >&5
-echo "$as_me: WARNING: poll.h: accepted by the compiler, rejected by the preprocessor!" >&2;}
-    { echo "$as_me:$LINENO: WARNING: poll.h: proceeding with the compiler's result" >&5
-echo "$as_me: WARNING: poll.h: proceeding with the compiler's result" >&2;}
+    { echo "$as_me:$LINENO: WARNING: sys/poll.h: accepted by the compiler, rejected by the preprocessor!" >&5
+echo "$as_me: WARNING: sys/poll.h: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { echo "$as_me:$LINENO: WARNING: sys/poll.h: proceeding with the compiler's result" >&5
+echo "$as_me: WARNING: sys/poll.h: proceeding with the compiler's result" >&2;}
     ac_header_preproc=yes
     ;;
   no:yes:* )
-    { echo "$as_me:$LINENO: WARNING: poll.h: present but cannot be compiled" >&5
-echo "$as_me: WARNING: poll.h: present but cannot be compiled" >&2;}
-    { echo "$as_me:$LINENO: WARNING: poll.h:     check for missing prerequisite headers?" >&5
-echo "$as_me: WARNING: poll.h:     check for missing prerequisite headers?" >&2;}
-    { echo "$as_me:$LINENO: WARNING: poll.h: see the Autoconf documentation" >&5
-echo "$as_me: WARNING: poll.h: see the Autoconf documentation" >&2;}
-    { echo "$as_me:$LINENO: WARNING: poll.h:     section \"Present But Cannot Be Compiled\"" >&5
-echo "$as_me: WARNING: poll.h:     section \"Present But Cannot Be Compiled\"" >&2;}
-    { echo "$as_me:$LINENO: WARNING: poll.h: proceeding with the preprocessor's result" >&5
-echo "$as_me: WARNING: poll.h: proceeding with the preprocessor's result" >&2;}
-    { echo "$as_me:$LINENO: WARNING: poll.h: in the future, the compiler will take precedence" >&5
-echo "$as_me: WARNING: poll.h: in the future, the compiler will take precedence" >&2;}
+    { echo "$as_me:$LINENO: WARNING: sys/poll.h: present but cannot be compiled" >&5
+echo "$as_me: WARNING: sys/poll.h: present but cannot be compiled" >&2;}
+    { echo "$as_me:$LINENO: WARNING: sys/poll.h:     check for missing prerequisite headers?" >&5
+echo "$as_me: WARNING: sys/poll.h:     check for missing prerequisite headers?" >&2;}
+    { echo "$as_me:$LINENO: WARNING: sys/poll.h: see the Autoconf documentation" >&5
+echo "$as_me: WARNING: sys/poll.h: see the Autoconf documentation" >&2;}
+    { echo "$as_me:$LINENO: WARNING: sys/poll.h:     section \"Present But Cannot Be Compiled\"" >&5
+echo "$as_me: WARNING: sys/poll.h:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { echo "$as_me:$LINENO: WARNING: sys/poll.h: proceeding with the preprocessor's result" >&5
+echo "$as_me: WARNING: sys/poll.h: proceeding with the preprocessor's result" >&2;}
+    { echo "$as_me:$LINENO: WARNING: sys/poll.h: in the future, the compiler will take precedence" >&5
+echo "$as_me: WARNING: sys/poll.h: in the future, the compiler will take precedence" >&2;}
 
     ;;
 esac
-{ echo "$as_me:$LINENO: checking for poll.h" >&5
-echo $ECHO_N "checking for poll.h... $ECHO_C" >&6; }
-if test "${ac_cv_header_poll_h+set}" = set; then
+{ echo "$as_me:$LINENO: checking for sys/poll.h" >&5
+echo $ECHO_N "checking for sys/poll.h... $ECHO_C" >&6; }
+if test "${ac_cv_header_sys_poll_h+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
-  ac_cv_header_poll_h=$ac_header_preproc
+  ac_cv_header_sys_poll_h=$ac_header_preproc
 fi
-{ echo "$as_me:$LINENO: result: $ac_cv_header_poll_h" >&5
-echo "${ECHO_T}$ac_cv_header_poll_h" >&6; }
+{ echo "$as_me:$LINENO: result: $ac_cv_header_sys_poll_h" >&5
+echo "${ECHO_T}$ac_cv_header_sys_poll_h" >&6; }
 
 fi
-if test $ac_cv_header_poll_h = yes; then
+if test $ac_cv_header_sys_poll_h = yes; then
   HAS_POLL=1
 fi
 
diff --git a/configure.ac b/configure.ac
index 9f48ec594880d45055ab7b316da8f0359ecdfeb2..3a56fbecc54112725b8af6689ab58cb7408a40a8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -241,6 +241,8 @@ AC_HEADER_STDC
 AC_HEADER_SYS_WAIT
 AC_CHECK_HEADERS([arpa/inet.h fcntl.h inttypes.h libintl.h limits.h locale.h malloc.h netdb.h netinet/in.h stddef.h stdint.h stdlib.h string.h strings.h sys/file.h sys/ioctl.h sys/param.h sys/socket.h sys/time.h syslog.h termios.h unistd.h utime.h])
 
+AC_CHECK_HEADERS([winsock.h winsock2.h])
+
 AC_SYS_LARGEFILE
 
 # Checks for typedefs, structures, and compiler characteristics.
@@ -285,6 +287,7 @@ AC_FUNC_VPRINTF
 AC_CHECK_FUNCS([asprintf atexit bzero dup2 endpwent ftruncate getcwd gethostbyname gethostname getloadavg gettimeofday inet_ntoa isascii localtime_r memchr memmove memset mkdir munmap putenv re_comp regcomp select setenv socket strcasecmp strcasestr strchr strcspn strdup strerror strlcat strlcpy strncasecmp strndup strnlen strrchr strsep strspn strstr strtol strtoq unsetenv utime vasprintf])
 
 AC_CHECK_FUNCS([glob])
+AC_CHECK_FUNCS([timersub])
 AC_CHECK_HEADER([sys/poll.h], [HAS_POLL=1],)
 AC_SUBST(HAS_POLL)
 
diff --git a/include/asterisk/autoconfig.h.in b/include/asterisk/autoconfig.h.in
index 5245a9524c598c05c257dd79ac9337f6c5bbedc4..b3b5001906e12ca2857560cfd9ccec1c3b11aa59 100644
--- a/include/asterisk/autoconfig.h.in
+++ b/include/asterisk/autoconfig.h.in
@@ -879,6 +879,9 @@
 /* Define to 1 if you have the <termios.h> header file. */
 #undef HAVE_TERMIOS_H
 
+/* Define to 1 if you have the `timersub' function. */
+#undef HAVE_TIMERSUB
+
 /* Define this to indicate the ${TINFO_DESCRIP} library */
 #undef HAVE_TINFO
 
@@ -951,6 +954,12 @@
 /* Define to 1 if you have the `vprintf' function. */
 #undef HAVE_VPRINTF
 
+/* Define to 1 if you have the <winsock2.h> header file. */
+#undef HAVE_WINSOCK2_H
+
+/* Define to 1 if you have the <winsock.h> header file. */
+#undef HAVE_WINSOCK_H
+
 /* Define to 1 if `fork' works. */
 #undef HAVE_WORKING_FORK