diff --git a/channels/chan_dahdi.c b/channels/chan_dahdi.c
index 4752294e55059a6ceb3ac4e9c58edacafa8fc8be..b9f44485fc18f942ccd2893e1efd0c97a1b6f476 100644
--- a/channels/chan_dahdi.c
+++ b/channels/chan_dahdi.c
@@ -5806,7 +5806,11 @@ static int dahdi_indicate(struct ast_channel *chan, int condition, const void *d
 					&& p->pri && !p->outgoing) {
 				if (p->pri->pri) {		
 					if (!pri_grab(p, p->pri)) {
+#ifdef HAVE_PRI_PROG_W_CAUSE
 						pri_progress_with_cause(p->pri->pri,p->call, PVT_TO_CHANNEL(p), 1, PRI_CAUSE_USER_BUSY); /* cause = 17 */
+#else
+						pri_progress(p->pri->pri,p->call, PVT_TO_CHANNEL(p), 1);
+#endif
 						pri_rel(p->pri);
 					}
 					else
@@ -5903,7 +5907,11 @@ static int dahdi_indicate(struct ast_channel *chan, int condition, const void *d
 					&& p->pri && !p->outgoing) {
 				if (p->pri->pri) {		
 					if (!pri_grab(p, p->pri)) {
+#ifdef HAVE_PRI_PROG_W_CAUSE
 						pri_progress_with_cause(p->pri->pri,p->call, PVT_TO_CHANNEL(p), 1, -1);  /* no cause at all */
+#else
+						pri_progress(p->pri->pri,p->call, PVT_TO_CHANNEL(p), 1);
+#endif
 						pri_rel(p->pri);
 					}
 					else
@@ -5939,7 +5947,11 @@ static int dahdi_indicate(struct ast_channel *chan, int condition, const void *d
 					&& p->pri && !p->outgoing) {
 				if (p->pri) {		
 					if (!pri_grab(p, p->pri)) {
+#ifdef HAVE_PRI_PROG_W_CAUSE
 						pri_progress_with_cause(p->pri->pri,p->call, PVT_TO_CHANNEL(p), 1, PRI_CAUSE_SWITCH_CONGESTION); /* cause = 42 */
+#else
+						pri_progress(p->pri->pri,p->call, PVT_TO_CHANNEL(p), 1);
+#endif
 						pri_rel(p->pri);
 					} else
 						ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
diff --git a/configure b/configure
index 6a501cbac5a831e9be13f80ae3a3f5f1e10f24c9..9504eb5b5de04d6425f77515ba3ff53ba1e65a62 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac Revision: 153709 .
+# From configure.ac Revision: 154151 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for asterisk 1.6.
 #
@@ -39713,7 +39713,7 @@ if test "x${PBX_PRI}" != "x1" -a "${USE_PRI}" != "no"; then
       	 pbxlibdir="-L${PRI_DIR}"
       fi
    fi
-   pbxfuncname="pri_progress_with_cause"
+   pbxfuncname="pri_new_bri"
    if test "x${pbxfuncname}" = "x" ; then   # empty lib, assume only headers
       AST_PRI_FOUND=yes
    else
@@ -39965,6 +39965,268 @@ fi
 
 
 
+if test "x${PBX_PRI_PROG_W_CAUSE}" != "x1" -a "${USE_PRI_PROG_W_CAUSE}" != "no"; then
+   pbxlibdir=""
+   # if --with-PRI_PROG_W_CAUSE=DIR has been specified, use it.
+   if test "x${PRI_PROG_W_CAUSE_DIR}" != "x"; then
+      if test -d ${PRI_PROG_W_CAUSE_DIR}/lib; then
+      	 pbxlibdir="-L${PRI_PROG_W_CAUSE_DIR}/lib"
+      else
+      	 pbxlibdir="-L${PRI_PROG_W_CAUSE_DIR}"
+      fi
+   fi
+   pbxfuncname="pri_progress_with_cause"
+   if test "x${pbxfuncname}" = "x" ; then   # empty lib, assume only headers
+      AST_PRI_PROG_W_CAUSE_FOUND=yes
+   else
+      as_ac_Lib=`echo "ac_cv_lib_pri_${pbxfuncname}" | $as_tr_sh`
+{ echo "$as_me:$LINENO: checking for ${pbxfuncname} in -lpri" >&5
+echo $ECHO_N "checking for ${pbxfuncname} in -lpri... $ECHO_C" >&6; }
+if { as_var=$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="-lpri ${pbxlibdir}  $LIBS"
+cat >conftest.$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}$ac_res" >&6; }
+if test `eval echo '${'$as_ac_Lib'}'` = yes; then
+  AST_PRI_PROG_W_CAUSE_FOUND=yes
+else
+  AST_PRI_PROG_W_CAUSE_FOUND=no
+fi
+
+   fi
+
+   # now check for the header.
+   if test "${AST_PRI_PROG_W_CAUSE_FOUND}" = "yes"; then
+      PRI_PROG_W_CAUSE_LIB="${pbxlibdir} -lpri "
+      # if --with-PRI_PROG_W_CAUSE=DIR has been specified, use it.
+      if test "x${PRI_PROG_W_CAUSE_DIR}" != "x"; then
+	 PRI_PROG_W_CAUSE_INCLUDE="-I${PRI_PROG_W_CAUSE_DIR}/include"
+      fi
+      PRI_PROG_W_CAUSE_INCLUDE="${PRI_PROG_W_CAUSE_INCLUDE} "
+      if test "xlibpri.h" = "x" ; then	# no header, assume found
+         PRI_PROG_W_CAUSE_HEADER_FOUND="1"
+      else				# check for the header
+         saved_cppflags="${CPPFLAGS}"
+         CPPFLAGS="${CPPFLAGS} ${PRI_PROG_W_CAUSE_INCLUDE}"
+	 if test "${ac_cv_header_libpri_h+set}" = set; then
+  { echo "$as_me:$LINENO: checking for libpri.h" >&5
+echo $ECHO_N "checking for libpri.h... $ECHO_C" >&6; }
+if test "${ac_cv_header_libpri_h+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+fi
+{ echo "$as_me:$LINENO: result: $ac_cv_header_libpri_h" >&5
+echo "${ECHO_T}$ac_cv_header_libpri_h" >&6; }
+else
+  # Is the header compilable?
+{ echo "$as_me:$LINENO: checking libpri.h usability" >&5
+echo $ECHO_N "checking libpri.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.  */
+$ac_includes_default
+#include <libpri.h>
+_ACEOF
+rm -f conftest.$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 libpri.h presence" >&5
+echo $ECHO_N "checking libpri.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 <libpri.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:$LINENO: WARNING: libpri.h: accepted by the compiler, rejected by the preprocessor!" >&5
+echo "$as_me: WARNING: libpri.h: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { echo "$as_me:$LINENO: WARNING: libpri.h: proceeding with the compiler's result" >&5
+echo "$as_me: WARNING: libpri.h: proceeding with the compiler's result" >&2;}
+    ac_header_preproc=yes
+    ;;
+  no:yes:* )
+    { echo "$as_me:$LINENO: WARNING: libpri.h: present but cannot be compiled" >&5
+echo "$as_me: WARNING: libpri.h: present but cannot be compiled" >&2;}
+    { echo "$as_me:$LINENO: WARNING: libpri.h:     check for missing prerequisite headers?" >&5
+echo "$as_me: WARNING: libpri.h:     check for missing prerequisite headers?" >&2;}
+    { echo "$as_me:$LINENO: WARNING: libpri.h: see the Autoconf documentation" >&5
+echo "$as_me: WARNING: libpri.h: see the Autoconf documentation" >&2;}
+    { echo "$as_me:$LINENO: WARNING: libpri.h:     section \"Present But Cannot Be Compiled\"" >&5
+echo "$as_me: WARNING: libpri.h:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { echo "$as_me:$LINENO: WARNING: libpri.h: proceeding with the preprocessor's result" >&5
+echo "$as_me: WARNING: libpri.h: proceeding with the preprocessor's result" >&2;}
+    { echo "$as_me:$LINENO: WARNING: libpri.h: in the future, the compiler will take precedence" >&5
+echo "$as_me: WARNING: libpri.h: in the future, the compiler will take precedence" >&2;}
+    ( cat <<\_ASBOX
+## ------------------------------- ##
+## Report this to www.asterisk.org ##
+## ------------------------------- ##
+_ASBOX
+     ) | sed "s/^/$as_me: WARNING:     /" >&2
+    ;;
+esac
+{ echo "$as_me:$LINENO: checking for libpri.h" >&5
+echo $ECHO_N "checking for libpri.h... $ECHO_C" >&6; }
+if test "${ac_cv_header_libpri_h+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_cv_header_libpri_h=$ac_header_preproc
+fi
+{ echo "$as_me:$LINENO: result: $ac_cv_header_libpri_h" >&5
+echo "${ECHO_T}$ac_cv_header_libpri_h" >&6; }
+
+fi
+if test $ac_cv_header_libpri_h = yes; then
+  PRI_PROG_W_CAUSE_HEADER_FOUND=1
+else
+  PRI_PROG_W_CAUSE_HEADER_FOUND=0
+fi
+
+
+         CPPFLAGS="${saved_cppflags}"
+      fi
+      if test "x${PRI_PROG_W_CAUSE_HEADER_FOUND}" = "x0" ; then
+         PRI_PROG_W_CAUSE_LIB=""
+         PRI_PROG_W_CAUSE_INCLUDE=""
+      else
+         if test "x${pbxfuncname}" = "x" ; then		# only checking headers -> no library
+	    PRI_PROG_W_CAUSE_LIB=""
+	 fi
+         PBX_PRI_PROG_W_CAUSE=1
+         # XXX don't know how to evaluate the description (third argument) in AC_DEFINE_UNQUOTED
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_PRI_PROG_W_CAUSE 1
+_ACEOF
+
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_PRI_PROG_W_CAUSE_VERSION
+_ACEOF
+
+      fi
+   fi
+fi
+
+
+
 if test "x${PBX_PRI_INBANDDISCONNECT}" != "x1" -a "${USE_PRI_INBANDDISCONNECT}" != "no"; then
    pbxlibdir=""
    # if --with-PRI_INBANDDISCONNECT=DIR has been specified, use it.
diff --git a/configure.ac b/configure.ac
index b3672b6c62164e34e41b10e9898114421f6d5433..596424143eee2ab3c5f621c04ca6aa3ece8fa9f8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1365,7 +1365,9 @@ AST_EXT_LIB_CHECK([POPT], [popt], [poptStrerror], [popt.h])
 
 AST_EXT_LIB_CHECK([PORTAUDIO], [portaudio], [Pa_GetDeviceCount], [portaudio.h])
 
-AST_EXT_LIB_CHECK([PRI], [pri], [pri_progress_with_cause], [libpri.h])
+AST_EXT_LIB_CHECK([PRI], [pri], [pri_new_bri], [libpri.h])
+
+AST_EXT_LIB_CHECK([PRI_PROG_W_CAUSE], [pri], [pri_progress_with_cause], [libpri.h])
 
 AST_EXT_LIB_CHECK([PRI_INBANDDISCONNECT], [pri], [pri_set_inbanddisconnect], [libpri.h])
 
diff --git a/include/asterisk/autoconfig.h.in b/include/asterisk/autoconfig.h.in
index 983f2cc3764b646a97d7f6332119b77e48e1066c..ccfcd83b2631ff826703a5793282d60a12d1972e 100644
--- a/include/asterisk/autoconfig.h.in
+++ b/include/asterisk/autoconfig.h.in
@@ -623,6 +623,12 @@
 /* Define to indicate the ${PRI_INBANDDISCONNECT_DESCRIP} library version */
 #undef HAVE_PRI_INBANDDISCONNECT_VERSION
 
+/* Define this to indicate the ${PRI_PROG_W_CAUSE_DESCRIP} library */
+#undef HAVE_PRI_PROG_W_CAUSE
+
+/* Define to indicate the ${PRI_PROG_W_CAUSE_DESCRIP} library version */
+#undef HAVE_PRI_PROG_W_CAUSE_VERSION
+
 /* Define to indicate the ${PRI_DESCRIP} library version */
 #undef HAVE_PRI_VERSION