diff --git a/pjsip-apps/src/python/_pjsua.c b/pjsip-apps/src/python/_pjsua.c
index 6d28d17..d25be6c 100644
--- a/pjsip-apps/src/python/_pjsua.c
+++ b/pjsip-apps/src/python/_pjsua.c
@@ -2183,7 +2183,7 @@
     }
 
     status = pjsua_im_send(acc_id, &to, mime_type, &content, 
-			   &msg_data, (void *)user_data);
+			   &msg_data, (void*)(long)user_data);
     if (pool)
 	pj_pool_release(pool);
     
@@ -3710,7 +3710,7 @@
     }
     
     status = pjsua_call_send_im(call_id, mime_type, &content, 
-				&msg_data, (void *)user_data);
+				&msg_data, (void*)(long)user_data);
 
     if (pool)
         pj_pool_release(pool);
diff --git a/pjsip-apps/src/python/_pjsua.h b/pjsip-apps/src/python/_pjsua.h
index 3b99c0d..754066a 100644
--- a/pjsip-apps/src/python/_pjsua.h
+++ b/pjsip-apps/src/python/_pjsua.h
@@ -1666,7 +1666,7 @@
     PyObject	    *contact_params;
     PyObject	    *contact_uri_params;
     int		     require_100rel;
-    int		     require_timer;
+    int		     use_timer;
     unsigned	     timer_se;
     unsigned	     timer_min_se;
     int		     allow_contact_rewrite;
@@ -1744,7 +1744,7 @@
     Py_XDECREF(obj->contact_uri_params);
     obj->contact_uri_params = PyString_FromPJ(&cfg->contact_uri_params);
     obj->require_100rel = cfg->require_100rel;
-    obj->require_timer = cfg->require_timer;
+    obj->use_timer = cfg->use_timer;
     obj->timer_se = cfg->timer_setting.sess_expires;
     obj->timer_min_se = cfg->timer_setting.min_se;
     obj->allow_contact_rewrite = cfg->allow_contact_rewrite;
@@ -1794,7 +1794,7 @@
     cfg->contact_params = PyString_ToPJ(obj->contact_params);
     cfg->contact_uri_params = PyString_ToPJ(obj->contact_uri_params);
     cfg->require_100rel = obj->require_100rel;
-    cfg->require_timer = obj->require_timer;
+    cfg->use_timer = obj->use_timer;
     cfg->timer_setting.sess_expires = obj->timer_se;
     cfg->timer_setting.min_se = obj->timer_min_se;
     cfg->allow_contact_rewrite = obj->allow_contact_rewrite;
@@ -1947,9 +1947,10 @@
 	"Require reliable provisional response."
     },
     {
-	"require_timer", T_INT,
-	offsetof(PyObj_pjsua_acc_config, require_timer), 0,
-	"Require session timer."
+	"use_timer", T_INT,
+	offsetof(PyObj_pjsua_acc_config, use_timer), 0,
+	"Use SIP session timers? (default=1)"
+	"0:inactive, 1:optional, 2:mandatory, 3:always"
     },
     {
 	"timer_se", T_INT,