diff --git a/libowlps/owlps.h b/libowlps/owlps.h
index 32518da..d3ced8c 100644
--- a/libowlps/owlps.h
+++ b/libowlps/owlps.h
@@ -136,6 +136,7 @@ typedef struct _owl_autocalibration_order
 #define OWL_REQUEST_CALIBRATION 1
 #define OWL_REQUEST_AUTOCALIBRATION 2
 #define OWL_REQUEST_IMPLICIT 10
+#define OWL_REQUEST_UNDEFINED 255
 
 
 /* Wi-Fi channel frequencies in Hz */
diff --git a/owlps-positioning/src/inputcsv.cc b/owlps-positioning/src/inputcsv.cc
index 254da16..c2c1dde 100644
--- a/owlps-positioning/src/inputcsv.cc
+++ b/owlps-positioning/src/inputcsv.cc
@@ -43,6 +43,16 @@ const Request& InputCSV::get_next_request()
   const Mobile &mobile = Stock::find_create_mobile(mac_mobile) ;
   current_request->set_mobile(&mobile) ;
 
+  // Read request type
+  uint8_t type ;
+  if (! file.read_field(type))
+    {
+      // Wrong number of fields: blank current request
+      current_request->clear() ;
+      return *current_request ;
+    }
+  current_request->set_type(type) ;
+
   // Read Timestamp field
   Timestamp timestamp ;
   if (! file.read_timestamp(timestamp))
@@ -94,8 +104,9 @@ const Request& InputCSV::get_next_request()
 
   current_request->set_measurements(measurements) ;
 
-  // If the direction is valid, it means we have a CalibrationRequest
-  if (direction)
+  // Calibration request?
+  if (type == OWL_REQUEST_CALIBRATION ||
+      type == OWL_REQUEST_AUTOCALIBRATION)
     {
       current_request_to_calibration_request() ;
       CalibrationRequest *request =
diff --git a/owlps-positioning/src/inputlogcsv.cc b/owlps-positioning/src/inputlogcsv.cc
index bd982d0..1661a7b 100644
--- a/owlps-positioning/src/inputlogcsv.cc
+++ b/owlps-positioning/src/inputlogcsv.cc
@@ -19,7 +19,10 @@ const string InputLogCSV::request_to_csv(const Request &request) const
   ostringstream csv_line ;
   if (request.get_mobile() != NULL)
     csv_line << request.get_mobile()->get_mac_addr() ;
-  csv_line << ';' << request.get_time_sent() << ';' ;
+  csv_line
+      << ';' << static_cast<uint_fast16_t>(request.get_type())
+      << ';' << request.get_time_sent()
+      << ';' ;
 
   const CalibrationRequest *calibration_request =
     dynamic_cast<const CalibrationRequest*>(&request) ;
diff --git a/owlps-positioning/src/inputudpsocket.cc b/owlps-positioning/src/inputudpsocket.cc
index e8a57c2..8d968f7 100644
--- a/owlps-positioning/src/inputudpsocket.cc
+++ b/owlps-positioning/src/inputudpsocket.cc
@@ -110,6 +110,9 @@ const Request& InputUDPSocket::get_next_request()
   const Mobile &mobile = Stock::find_create_mobile(mac_mobile) ;
   current_request->set_mobile(&mobile) ;
 
+  // Request type
+  current_request->set_type(request.type) ;
+
   // Timestamp
   current_request->set_time_sent(Timestamp(request.request_time)) ;
 
diff --git a/owlps-positioning/src/outputcsv.cc b/owlps-positioning/src/outputcsv.cc
index b209c46..c413e09 100644
--- a/owlps-positioning/src/outputcsv.cc
+++ b/owlps-positioning/src/outputcsv.cc
@@ -20,10 +20,12 @@ const string OutputCSV::result_to_csv(const Result &result)
     {
       if (request->get_mobile() != NULL)
         csv_line << request->get_mobile()->get_mac_addr() ;
-      csv_line << ';' << request->get_time_sent() ;
+      csv_line
+          << ';' << static_cast<uint_fast16_t>(request->get_type())
+          << ';' << request->get_time_sent() ;
     }
   else
-    csv_line << ';' ;
+    csv_line << ";;;" ;
 
   Point3D position = result.get_position() ;
   csv_line
diff --git a/owlps-positioning/src/request.cc b/owlps-positioning/src/request.cc
index 8662093..4ef2dc4 100644
--- a/owlps-positioning/src/request.cc
+++ b/owlps-positioning/src/request.cc
@@ -30,6 +30,7 @@ Request::~Request()
  */
 void Request::clear()
 {
+  type = OWL_REQUEST_UNDEFINED ;
   mobile = NULL ;
   time_sent.clear() ;
   measurements.clear() ;
@@ -45,6 +46,7 @@ const Request& Request::operator=(const Request &source)
   if (this == &source)
     return *this ;
 
+  type = source.type ;
   mobile = source.mobile ;
   time_sent = source.time_sent ;
   measurements = source.measurements ;
@@ -59,6 +61,7 @@ bool Request::operator==(const Request &source) const
     return true ;
 
   return
+    type == source.type &&
     mobile == source.mobile &&
     time_sent == source.time_sent &&
     measurements == source.measurements ;
@@ -74,7 +77,8 @@ ostream& operator<<(ostream &os, const Request &r)
 
   // MAC address
   os
-      << "Mobile: "
+      << "Type: " << static_cast<uint_fast16_t>(r.type)
+      << ", Mobile: "
       << (r.mobile != NULL ? r.mobile->get_mac_addr() : "Unknown_Mobile")
       << ":" ;
 
@@ -101,6 +105,7 @@ size_t hash_value(const Request &source)
 {
   size_t seed = 0 ;
 
+  boost::hash_combine(seed, source.type) ;
   boost::hash_combine(seed, source.time_sent) ;
   if (source.mobile != NULL)
     boost::hash_combine(seed, source.mobile->get_mac_addr()) ;
diff --git a/owlps-positioning/src/request.hh b/owlps-positioning/src/request.hh
index 81a119a..59fb421 100644
--- a/owlps-positioning/src/request.hh
+++ b/owlps-positioning/src/request.hh
@@ -6,6 +6,8 @@ class Mobile ;
 #include "measurement.hh"
 #include "timestamp.hh"
 
+#include <owlps.h>
+
 #include <ctime>
 #include <boost/tr1/unordered_map.hpp>
 #include <ostream>
@@ -14,6 +16,8 @@ class Mobile ;
 class Request
 {
 protected:
+  /// Type of the request
+  uint_fast8_t type ;
   /// The mobile that sent the request
   Mobile *mobile ;
   /// Local date of the request on the mobile
@@ -29,21 +33,25 @@ public:
           const std::tr1::unordered_map<std::string, Measurement>
           &_measurements =
             std::tr1::unordered_map<std::string, Measurement>()):
+    type(OWL_REQUEST_UNDEFINED),
     mobile(const_cast<Mobile*>(_mobile)), time_sent(_time_sent),
     measurements(_measurements) {}
 
   Request(const std::tr1::unordered_map<std::string, Measurement>
           &_measurements):
+    type(OWL_REQUEST_UNDEFINED),
     mobile(NULL), measurements(_measurements) {}
 
   Request(const Timestamp &_time_sent,
           const std::tr1::unordered_map<std::string, Measurement>
           &_measurements =
             std::tr1::unordered_map<std::string, Measurement>()):
+    type(OWL_REQUEST_UNDEFINED),
     mobile(NULL), time_sent(_time_sent),
     measurements(_measurements) {}
 
   Request(const Request &source):
+    type(source.type),
     mobile(source.mobile), time_sent(source.time_sent),
     measurements(source.measurements) {}
 
@@ -51,6 +59,7 @@ public:
 
   /** @name Read accessors */
   //@{
+  uint8_t get_type(void) const ;
   Mobile* get_mobile(void) const ;
   const Timestamp& get_time_sent(void) const ;
   const std::tr1::unordered_map<std::string, Measurement>&
@@ -59,6 +68,7 @@ public:
 
   /** @name Write accessors */
   //@{
+  void set_type(const uint8_t _type) ;
   void set_mobile(const Mobile *_mobile) ;
   void set_time_sent(const Timestamp &_time_sent) ;
   void set_measurements(const std::tr1::unordered_map
@@ -86,6 +96,13 @@ public:
 /* *** Read accessors *** */
 
 
+
+inline uint8_t Request::get_type() const
+{
+  return type ;
+}
+
+
 inline Mobile* Request::get_mobile() const
 {
   return mobile ;
@@ -109,6 +126,12 @@ Request::get_measurements(void) const
 /* *** Write accessors *** */
 
 
+inline void Request::set_type(const uint8_t _type)
+{
+  type = _type ;
+}
+
+
 inline void Request::set_mobile(const Mobile *_mobile)
 {
   mobile = const_cast<Mobile*>(_mobile) ;