diff --git a/src/include/switch_console.h b/src/include/switch_console.h
index e7a2d271e7..3c3f24ee90 100644
--- a/src/include/switch_console.h
+++ b/src/include/switch_console.h
@@ -67,7 +67,7 @@ SWITCH_DECLARE(void) switch_console_printf(switch_text_channel_t channel, const
 /*!
   \brief A method akin to printf for dealing with api streams
 */
-SWITCH_DECLARE(switch_status_t) switch_console_stream_write(switch_stream_handle_t *handle, char *fmt, ...) PRINTF_FUNCTION(2,3);
+SWITCH_DECLARE(switch_status_t) switch_console_stream_write(switch_stream_handle_t *handle, const char *fmt, ...) PRINTF_FUNCTION(2,3);
 SWITCH_END_EXTERN_C
 
 #endif
diff --git a/src/include/switch_event.h b/src/include/switch_event.h
index 0c7f8f38b4..05254128fc 100644
--- a/src/include/switch_event.h
+++ b/src/include/switch_event.h
@@ -172,7 +172,7 @@ SWITCH_DECLARE(char *) switch_event_get_body(switch_event_t *event);
   \param fmt the value of the header (varargs see standard sprintf family)
   \return SWITCH_STATUS_SUCCESS if the header was added
 */
-SWITCH_DECLARE(switch_status_t) switch_event_add_header(switch_event_t *event, switch_stack_t stack, char *header_name, char *fmt, ...) PRINTF_FUNCTION(4,5);
+SWITCH_DECLARE(switch_status_t) switch_event_add_header(switch_event_t *event, switch_stack_t stack, const char *header_name, const char *fmt, ...) PRINTF_FUNCTION(4,5);
 
 /*!
   \brief Destroy an event
@@ -251,7 +251,7 @@ SWITCH_DECLARE(switch_status_t) switch_event_serialize(switch_event_t *event, ch
   \return the xml object if the operation was successful
   \note the body supplied by this function will supersede an existing body the event may have
 */
-SWITCH_DECLARE(switch_xml_t) switch_event_xmlize(switch_event_t *event, char *fmt, ...) PRINTF_FUNCTION(2,3);
+SWITCH_DECLARE(switch_xml_t) switch_event_xmlize(switch_event_t *event, const char *fmt, ...) PRINTF_FUNCTION(2,3);
 
 /*!
   \brief Determine if the event system has been initilized
@@ -266,7 +266,7 @@ SWITCH_DECLARE(switch_status_t) switch_event_running(void);
   \return SWITCH_STATUS_SUCCESS if the body was added to the event
   \note the body parameter can be shadowed by the switch_event_reserve_subclass_detailed function
 */
-SWITCH_DECLARE(switch_status_t) switch_event_add_body(switch_event_t *event, char *fmt, ...) PRINTF_FUNCTION(2,3);
+SWITCH_DECLARE(switch_status_t) switch_event_add_body(switch_event_t *event, const char *fmt, ...) PRINTF_FUNCTION(2,3);
 
 
 /*!
diff --git a/src/include/switch_log.h b/src/include/switch_log.h
index 964f00f557..fb49ac4ab6 100644
--- a/src/include/switch_log.h
+++ b/src/include/switch_log.h
@@ -94,7 +94,7 @@ SWITCH_DECLARE(switch_status_t) switch_log_shutdown(void);
   \param ... variable args
   \note there are channel macros to supply the first 4 parameters
 */
-SWITCH_DECLARE(void) switch_log_printf(switch_text_channel_t channel, const char *file, const char *func, int line, switch_log_level_t level, char *fmt, ...) PRINTF_FUNCTION(6,7);
+SWITCH_DECLARE(void) switch_log_printf(switch_text_channel_t channel, const char *file, const char *func, int line, switch_log_level_t level, const char *fmt, ...) PRINTF_FUNCTION(6,7);
 
 /*! 
   \brief Shut down  the logging engine
diff --git a/src/switch_console.c b/src/switch_console.c
index 5c9c22f14b..380757d32f 100644
--- a/src/switch_console.c
+++ b/src/switch_console.c
@@ -35,7 +35,7 @@
 #define CMD_BUFLEN 1024;
 
 
-SWITCH_DECLARE(switch_status_t) switch_console_stream_write(switch_stream_handle_t *handle, char *fmt, ...)
+SWITCH_DECLARE(switch_status_t) switch_console_stream_write(switch_stream_handle_t *handle, const char *fmt, ...)
 {
 	va_list ap;
 	char *buf = handle->data;
diff --git a/src/switch_event.c b/src/switch_event.c
index 74844de043..fe72863ca4 100644
--- a/src/switch_event.c
+++ b/src/switch_event.c
@@ -474,8 +474,8 @@ SWITCH_DECLARE(char *) switch_event_get_body(switch_event_t *event)
 	return NULL;
 }
 
-SWITCH_DECLARE(switch_status_t) switch_event_add_header(switch_event_t *event, switch_stack_t stack, char *header_name,
-													  char *fmt, ...)
+SWITCH_DECLARE(switch_status_t) switch_event_add_header(switch_event_t *event, switch_stack_t stack, const char *header_name,
+													  const char *fmt, ...)
 {
 	int ret = 0;
 	char data[2048];
@@ -516,7 +516,7 @@ SWITCH_DECLARE(switch_status_t) switch_event_add_header(switch_event_t *event, s
 }
 
 
-SWITCH_DECLARE(switch_status_t) switch_event_add_body(switch_event_t *event, char *fmt, ...)
+SWITCH_DECLARE(switch_status_t) switch_event_add_body(switch_event_t *event, const char *fmt, ...)
 {
 	int ret = 0;
 	char *data;
@@ -729,7 +729,7 @@ static switch_xml_t add_xml_header(switch_xml_t xml, char *name, char *value, in
 	return header;
 }
 
-SWITCH_DECLARE(switch_xml_t) switch_event_xmlize(switch_event_t *event, char *fmt, ...)
+SWITCH_DECLARE(switch_xml_t) switch_event_xmlize(switch_event_t *event, const char *fmt, ...)
 {
 	switch_event_header_t *hp;
 	char *data = NULL, *body = NULL;
diff --git a/src/switch_log.c b/src/switch_log.c
index 1928bea15b..8c85274065 100644
--- a/src/switch_log.c
+++ b/src/switch_log.c
@@ -162,7 +162,7 @@ static void *SWITCH_THREAD_FUNC log_thread(switch_thread_t *thread, void *obj)
 	return NULL;
 }
 
-SWITCH_DECLARE(void) switch_log_printf(switch_text_channel_t channel, const char *file, const char *func, int line, switch_log_level_t level, char *fmt, ...)
+SWITCH_DECLARE(void) switch_log_printf(switch_text_channel_t channel, const char *file, const char *func, int line, switch_log_level_t level, const char *fmt, ...)
 {
 	char *data = NULL;
 	char *new_fmt = NULL;