TT#170203 add support for REFER

Also take this opportunity to renumber the method codes for easier
maintenance.

Change-Id: I8e7998deb2e2998eb308121ad94e6d68c9eae5b0

cdr.c

@@ -1629,6 +1629,10 @@ void cdr_parse_entry(med_entry_t *e)
     {
         e->method = MED_BYE;
     }
+    else if (strcmp(e->sip_method, MSG_REFER) == 0)
+    {
+        e->method = MED_REFER;
+    }
     else
     {
         e->method = MED_UNRECOGNIZED;

cdr.h

@@ -5,6 +5,7 @@
 
 #define MSG_INVITE "INVITE"
 #define MSG_BYE    "BYE"
+#define MSG_REFER  "REFER"
 
 #define CDR_STATUS_OK       "ok"
 #define CDR_STATUS_BUSY     "busy"

mediator.h

@@ -69,9 +69,10 @@ extern int mediator_lockfd;
 extern sig_atomic_t mediator_shutdown;
 
 typedef enum {
-    MED_INVITE = 1,
-    MED_BYE = 2,
-    MED_UNRECOGNIZED = 3
+    MED_UNRECOGNIZED = 0,
+    MED_INVITE,
+    MED_BYE,
+    MED_REFER,
 } med_method_t;
 
 

medredis.c

@@ -273,12 +273,13 @@ static int medredis_remove_mappings(const char* cid, char* key, const char *meth
     }
 
     // delete cid from acc:meth::$METHOD and handle acc::index::meth mappings
-    char *methods[2];
+    char *methods[3];
     int num_methods;
     if (!method || !method[0]) {
         methods[0] = "acc:meth::INVITE";
         methods[1] = "acc:meth::BYE";
-        num_methods = 2;
+        methods[2] = "acc:meth::REFER";
+        num_methods = 3;
     }
     else {
         method_key = g_strdup_printf("acc:meth::%s", method);