FS-3571 FS-3442 FS-957 --resolve tighten up the parsing of these boolean vals issue in t38 sdp

src/include/switch_types.h

@@ -868,6 +868,7 @@ typedef struct {
 	uint16_t remote_port;
 	const char *local_ip;
 	uint16_t local_port;
+	const char *sdp_o_line;
 } switch_t38_options_t;
 
 /*!

src/include/switch_utils.h

@@ -525,6 +525,18 @@ static inline char *switch_clean_name_string(char *s)
 
 
 
+/*!
+  \brief Turn a string into a number (default if NULL)
+  \param nptr the string
+  \param dft the default
+  \return the number version of the string or the default
+*/
+static inline int switch_safe_atoi(const char *nptr, int dft)
+{
+	return nptr ? atoi(nptr) : dft;
+}
+
+
 /*!
   \brief Free a pointer and set it to NULL unless it already is NULL
   \param it the pointer