diff --git a/build_tools/menuselect-deps.in b/build_tools/menuselect-deps.in
index 65d7f7207744bed8911b67bb79e611ea372e78e3..f29ab89201097524cbb351813ca9abe263d0c7a4 100644
--- a/build_tools/menuselect-deps.in
+++ b/build_tools/menuselect-deps.in
@@ -29,6 +29,7 @@ PORTAUDIO=@PBX_PORTAUDIO@
 PRI=@PBX_PRI@
 RADIUS=@PBX_RADIUS@
 SPEEX=@PBX_SPEEX@
+SPEEXDSP=@PBX_SPEEXDSP@
 SQLITE3=@PBX_SQLITE3@
 SQLITE=@PBX_SQLITE@
 SS7=@PBX_SS7@
diff --git a/codecs/codec_speex.c b/codecs/codec_speex.c
index 21c98a5f58804f235f17128112275740d1c4f35f..035f9958bf6b38b6db162aeae4995082994ee2b4 100644
--- a/codecs/codec_speex.c
+++ b/codecs/codec_speex.c
@@ -32,6 +32,7 @@
 
 /*** MODULEINFO
 	<depend>speex</depend>
+	<use>speexdsp</use>
  ***/
 
 #include "asterisk.h"
diff --git a/configure b/configure
index a7855ff9b423a2c1d01ceb7532a44439491b7e91..a0f26a63a2552249a3f184248835a1e04569406f 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac Revision: 98604 .
+# From configure.ac Revision: 98605 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for asterisk 1.4.
 #
@@ -857,6 +857,10 @@ SPEEX_LIB
 SPEEX_INCLUDE
 SPEEX_DIR
 PBX_SPEEX
+SPEEXDSP_LIB
+SPEEXDSP_INCLUDE
+SPEEXDSP_DIR
+PBX_SPEEXDSP
 SQLITE_LIB
 SQLITE_INCLUDE
 SQLITE_DIR
@@ -1603,6 +1607,7 @@ Optional Packages:
   --with-h323=PATH        use OpenH323 files in PATH
   --with-radius=PATH      use Radius Client files in PATH
   --with-speex=PATH       use Speex files in PATH
+  --with-speexdsp=PATH    use Speexdsp files in PATH
   --with-sqlite=PATH      use SQLite files in PATH
   --with-sqlite3=PATH     use SQLite files in PATH
   --with-suppserv=PATH    use mISDN Supplemental Services files in PATH
@@ -8884,6 +8889,34 @@ fi
 
 
 
+    SPEEXDSP_DESCRIP="Speexdsp"
+    SPEEXDSP_OPTION="speexdsp"
+
+# Check whether --with-speexdsp was given.
+if test "${with_speexdsp+set}" = set; then
+  withval=$with_speexdsp;
+	case ${withval} in
+	n|no)
+	USE_SPEEXDSP=no
+	;;
+	y|ye|yes)
+	ac_mandatory_list="${ac_mandatory_list} SPEEXDSP"
+	;;
+	*)
+	SPEEXDSP_DIR="${withval}"
+	ac_mandatory_list="${ac_mandatory_list} SPEEXDSP"
+	;;
+	esac
+
+fi
+
+    PBX_SPEEXDSP=0
+
+
+
+
+
+
     SQLITE_DESCRIP="SQLite"
     SQLITE_OPTION="sqlite"
 
@@ -40919,6 +40952,268 @@ fi
 
 
 
+if test "x${PBX_SPEEXDSP}" != "x1" -a "${USE_SPEEXDSP}" != "no"; then
+   pbxlibdir=""
+   # if --with-SPEEXDSP=DIR has been specified, use it.
+   if test "x${SPEEXDSP_DIR}" != "x"; then
+      if test -d ${SPEEXDSP_DIR}/lib; then
+      	 pbxlibdir="-L${SPEEXDSP_DIR}/lib"
+      else
+      	 pbxlibdir="-L${SPEEXDSP_DIR}"
+      fi
+   fi
+   pbxfuncname="speex_preprocess_ctl"
+   if test "x${pbxfuncname}" = "x" ; then   # empty lib, assume only headers
+      AST_SPEEXDSP_FOUND=yes
+   else
+      as_ac_Lib=`echo "ac_cv_lib_speexdsp_${pbxfuncname}" | $as_tr_sh`
+{ echo "$as_me:$LINENO: checking for ${pbxfuncname} in -lspeexdsp" >&5
+echo $ECHO_N "checking for ${pbxfuncname} in -lspeexdsp... $ECHO_C" >&6; }
+if { as_var=$as_ac_Lib; eval "test \"\${$as_var+set}\" = set"; }; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lspeexdsp ${pbxlibdir} -lm $LIBS"
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+/* 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 ${pbxfuncname} ();
+int
+main ()
+{
+return ${pbxfuncname} ();
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$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 "$as_ac_Lib=yes"
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	eval "$as_ac_Lib=no"
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+ac_res=`eval echo '${'$as_ac_Lib'}'`
+	       { echo "$as_me:$LINENO: result: $ac_res" >&5
+echo "${ECHO_T}$ac_res" >&6; }
+if test `eval echo '${'$as_ac_Lib'}'` = yes; then
+  AST_SPEEXDSP_FOUND=yes
+else
+  AST_SPEEXDSP_FOUND=no
+fi
+
+   fi
+
+   # now check for the header.
+   if test "${AST_SPEEXDSP_FOUND}" = "yes"; then
+      SPEEXDSP_LIB="${pbxlibdir} -lspeexdsp -lm"
+      # if --with-SPEEXDSP=DIR has been specified, use it.
+      if test "x${SPEEXDSP_DIR}" != "x"; then
+	 SPEEXDSP_INCLUDE="-I${SPEEXDSP_DIR}/include"
+      fi
+      SPEEXDSP_INCLUDE="${SPEEXDSP_INCLUDE} "
+      if test "xspeex/speex.h" = "x" ; then	# no header, assume found
+         SPEEXDSP_HEADER_FOUND="1"
+      else				# check for the header
+         saved_cppflags="${CPPFLAGS}"
+         CPPFLAGS="${CPPFLAGS} ${SPEEXDSP_INCLUDE} "
+	 if test "${ac_cv_header_speex_speex_h+set}" = set; then
+  { echo "$as_me:$LINENO: checking for speex/speex.h" >&5
+echo $ECHO_N "checking for speex/speex.h... $ECHO_C" >&6; }
+if test "${ac_cv_header_speex_speex_h+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+fi
+{ echo "$as_me:$LINENO: result: $ac_cv_header_speex_speex_h" >&5
+echo "${ECHO_T}$ac_cv_header_speex_speex_h" >&6; }
+else
+  # Is the header compilable?
+{ echo "$as_me:$LINENO: checking speex/speex.h usability" >&5
+echo $ECHO_N "checking speex/speex.h 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.  */
+$ac_includes_default
+#include <speex/speex.h>
+_ACEOF
+rm -f conftest.$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 speex/speex.h presence" >&5
+echo $ECHO_N "checking speex/speex.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 <speex/speex.h>
+_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:$LINENO: WARNING: speex/speex.h: accepted by the compiler, rejected by the preprocessor!" >&5
+echo "$as_me: WARNING: speex/speex.h: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { echo "$as_me:$LINENO: WARNING: speex/speex.h: proceeding with the compiler's result" >&5
+echo "$as_me: WARNING: speex/speex.h: proceeding with the compiler's result" >&2;}
+    ac_header_preproc=yes
+    ;;
+  no:yes:* )
+    { echo "$as_me:$LINENO: WARNING: speex/speex.h: present but cannot be compiled" >&5
+echo "$as_me: WARNING: speex/speex.h: present but cannot be compiled" >&2;}
+    { echo "$as_me:$LINENO: WARNING: speex/speex.h:     check for missing prerequisite headers?" >&5
+echo "$as_me: WARNING: speex/speex.h:     check for missing prerequisite headers?" >&2;}
+    { echo "$as_me:$LINENO: WARNING: speex/speex.h: see the Autoconf documentation" >&5
+echo "$as_me: WARNING: speex/speex.h: see the Autoconf documentation" >&2;}
+    { echo "$as_me:$LINENO: WARNING: speex/speex.h:     section \"Present But Cannot Be Compiled\"" >&5
+echo "$as_me: WARNING: speex/speex.h:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { echo "$as_me:$LINENO: WARNING: speex/speex.h: proceeding with the preprocessor's result" >&5
+echo "$as_me: WARNING: speex/speex.h: proceeding with the preprocessor's result" >&2;}
+    { echo "$as_me:$LINENO: WARNING: speex/speex.h: in the future, the compiler will take precedence" >&5
+echo "$as_me: WARNING: speex/speex.h: in the future, the compiler will take precedence" >&2;}
+    ( cat <<\_ASBOX
+## ------------------------------- ##
+## Report this to www.asterisk.org ##
+## ------------------------------- ##
+_ASBOX
+     ) | sed "s/^/$as_me: WARNING:     /" >&2
+    ;;
+esac
+{ echo "$as_me:$LINENO: checking for speex/speex.h" >&5
+echo $ECHO_N "checking for speex/speex.h... $ECHO_C" >&6; }
+if test "${ac_cv_header_speex_speex_h+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_cv_header_speex_speex_h=$ac_header_preproc
+fi
+{ echo "$as_me:$LINENO: result: $ac_cv_header_speex_speex_h" >&5
+echo "${ECHO_T}$ac_cv_header_speex_speex_h" >&6; }
+
+fi
+if test $ac_cv_header_speex_speex_h = yes; then
+  SPEEXDSP_HEADER_FOUND=1
+else
+  SPEEXDSP_HEADER_FOUND=0
+fi
+
+
+         CPPFLAGS="${saved_cppflags}"
+      fi
+      if test "x${SPEEXDSP_HEADER_FOUND}" = "x0" ; then
+         SPEEXDSP_LIB=""
+         SPEEXDSP_INCLUDE=""
+      else
+         if test "x${pbxfuncname}" = "x" ; then		# only checking headers -> no library
+	    SPEEXDSP_LIB=""
+	 fi
+         PBX_SPEEXDSP=1
+         # XXX don't know how to evaluate the description (third argument) in AC_DEFINE_UNQUOTED
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_SPEEXDSP 1
+_ACEOF
+
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_SPEEXDSP_VERSION
+_ACEOF
+
+      fi
+   fi
+fi
+
+
+
 if test "x${PBX_SQLITE}" != "x1" -a "${USE_SQLITE}" != "no"; then
    pbxlibdir=""
    # if --with-SQLITE=DIR has been specified, use it.
@@ -49061,6 +49356,10 @@ SPEEX_LIB!$SPEEX_LIB$ac_delim
 SPEEX_INCLUDE!$SPEEX_INCLUDE$ac_delim
 SPEEX_DIR!$SPEEX_DIR$ac_delim
 PBX_SPEEX!$PBX_SPEEX$ac_delim
+SPEEXDSP_LIB!$SPEEXDSP_LIB$ac_delim
+SPEEXDSP_INCLUDE!$SPEEXDSP_INCLUDE$ac_delim
+SPEEXDSP_DIR!$SPEEXDSP_DIR$ac_delim
+PBX_SPEEXDSP!$PBX_SPEEXDSP$ac_delim
 SQLITE_LIB!$SQLITE_LIB$ac_delim
 SQLITE_INCLUDE!$SQLITE_INCLUDE$ac_delim
 SQLITE_DIR!$SQLITE_DIR$ac_delim
@@ -49111,10 +49410,6 @@ X11_DIR!$X11_DIR$ac_delim
 PBX_X11!$PBX_X11$ac_delim
 ZLIB_LIB!$ZLIB_LIB$ac_delim
 ZLIB_INCLUDE!$ZLIB_INCLUDE$ac_delim
-ZLIB_DIR!$ZLIB_DIR$ac_delim
-PBX_ZLIB!$PBX_ZLIB$ac_delim
-ZAPTEL_LIB!$ZAPTEL_LIB$ac_delim
-ZAPTEL_INCLUDE!$ZAPTEL_INCLUDE$ac_delim
 _ACEOF
 
   if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 97; then
@@ -49156,6 +49451,10 @@ _ACEOF
 ac_delim='%!_!# '
 for ac_last_try in false false false false false :; do
   cat >conf$$subs.sed <<_ACEOF
+ZLIB_DIR!$ZLIB_DIR$ac_delim
+PBX_ZLIB!$PBX_ZLIB$ac_delim
+ZAPTEL_LIB!$ZAPTEL_LIB$ac_delim
+ZAPTEL_INCLUDE!$ZAPTEL_INCLUDE$ac_delim
 ZAPTEL_DIR!$ZAPTEL_DIR$ac_delim
 PBX_ZAPTEL!$PBX_ZAPTEL$ac_delim
 ZAPTEL_TRANSCODE_LIB!$ZAPTEL_TRANSCODE_LIB$ac_delim
@@ -49220,7 +49519,7 @@ CURL_CONFIG!$CURL_CONFIG$ac_delim
 LTLIBOBJS!$LTLIBOBJS$ac_delim
 _ACEOF
 
-  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 62; then
+  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 66; then
     break
   elif $ac_last_try; then
     { { echo "$as_me:$LINENO: error: could not make $CONFIG_STATUS" >&5
diff --git a/configure.ac b/configure.ac
index 299fcd6bf68b4a289b9bdf346ef26703ddd79532..4d656c0ad7ddcfc6336427eba1db18fe6ba8d6f0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -236,6 +236,7 @@ AST_EXT_LIB_SETUP([PWLIB], [PWlib], [pwlib])
 AST_EXT_LIB_SETUP([OPENH323], [OpenH323], [h323])
 AST_EXT_LIB_SETUP([RADIUS], [Radius Client], [radius])
 AST_EXT_LIB_SETUP([SPEEX], [Speex], [speex])
+AST_EXT_LIB_SETUP([SPEEXDSP], [Speexdsp], [speexdsp])
 AST_EXT_LIB_SETUP([SQLITE], [SQLite], [sqlite])
 AST_EXT_LIB_SETUP([SQLITE3], [SQLite], [sqlite3])
 AST_EXT_LIB_SETUP([SUPPSERV], [mISDN Supplemental Services], [suppserv])
@@ -941,6 +942,8 @@ AST_EXT_LIB_CHECK([RADIUS], [radiusclient-ng], [rc_read_config], [radiusclient-n
 
 AST_EXT_LIB_CHECK([SPEEX], [speex], [speex_encode], [speex/speex.h], [-lm])
 
+AST_EXT_LIB_CHECK([SPEEXDSP], [speexdsp], [speex_preprocess_ctl], [speex/speex.h], [-lm])
+
 AST_EXT_LIB_CHECK([SQLITE], [sqlite], [sqlite_exec], [sqlite.h])
 
 AST_EXT_LIB_CHECK([SQLITE3], [sqlite3], [sqlite3_open], [sqlite3.h])
diff --git a/include/asterisk/autoconfig.h.in b/include/asterisk/autoconfig.h.in
index 5202be17ae748ae9b8bf7f6a75223070860fed7d..3e9217689e2ae1b53c071d2dde1d8fa08ad495fe 100644
--- a/include/asterisk/autoconfig.h.in
+++ b/include/asterisk/autoconfig.h.in
@@ -703,6 +703,12 @@
 /* Define this to indicate the ${SPEEX_DESCRIP} library */
 #undef HAVE_SPEEX
 
+/* Define this to indicate the ${SPEEXDSP_DESCRIP} library */
+#undef HAVE_SPEEXDSP
+
+/* Define to indicate the ${SPEEXDSP_DESCRIP} library version */
+#undef HAVE_SPEEXDSP_VERSION
+
 /* Define to indicate the ${SPEEX_DESCRIP} library version */
 #undef HAVE_SPEEX_VERSION
 
diff --git a/makeopts.in b/makeopts.in
index 10dced8fc3d61d3154d9ac46dd17a6c345597d78..aac5cf8b184f5597c7befc3542dfd1ffd5247118 100644
--- a/makeopts.in
+++ b/makeopts.in
@@ -165,6 +165,9 @@ SDL_IMAGE_LIB=@SDL_IMAGE_LIB@
 SPEEX_INCLUDE=@SPEEX_INCLUDE@
 SPEEX_LIB=@SPEEX_LIB@
 
+SPEEXDSP_INCLUDE=@SPEEXDSP_INCLUDE@
+SPEEXDSP_LIB=@SPEEXDSP_LIB@
+
 SQLITE_INCLUDE=@SQLITE_INCLUDE@
 SQLITE_LIB=@SQLITE_LIB@