diff --git a/kamailio/presence-role.cfg b/kamailio/presence-role.cfg
index 16358fe..c9a28a4 100644
--- a/kamailio/presence-role.cfg
+++ b/kamailio/presence-role.cfg
@@ -1,4 +1,8 @@
 ######## Presence server module ########
+#!trydef PRESENCE_MIN_EXPIRES 300
+#!trydef PRESENCE_MIN_EXPIRES_ACTION 2
+#!trydef PRESENCE_MAX_EXPIRES 3600
+
 modparam("htable", "htable", "p=>size=32;autoexpire=600;")
 
 loadmodule "presence.so"
@@ -14,9 +18,9 @@ modparam("presence", "expires_offset", 60)
 modparam("presence", "send_fast_notify", 1)
 modparam("presence", "clean_period", 30)
 modparam("presence", "publ_cache", 0)
-modparam("presence", "min_expires_action", 2)
-modparam("presence", "min_expires", 300)
-modparam("presence", "max_expires", 3600)
+modparam("presence", "min_expires_action", PRESENCE_MIN_EXPIRES_ACTION)
+modparam("presence", "min_expires", PRESENCE_MIN_EXPIRES)
+modparam("presence", "max_expires", PRESENCE_MAX_EXPIRES)
 modparam("presence", "sip_uri_match", 1)
 modparam("presence", "waitn_time", 1)
 modparam("presence", "notifier_processes", 5)
@@ -58,6 +62,13 @@ route[HANDLE_SUBSCRIBE]
             exit;
         }
 
+        $var(Expires) = $hdr(Expires);
+        if($var(Expires) < PRESENCE_MIN_EXPIRES) {
+            $var(Expires) = PRESENCE_MIN_EXPIRES;
+        } else if($var(Expires) > PRESENCE_MAX_EXPIRES) {
+            $var(Expires) = PRESENCE_MAX_EXPIRES;
+        }
+        
         ##RabbitMQ
         $var(fs_path) = "%3C" + $rz + "%3A" + $Ri + "%3A" + $Rp + "%3Btransport=" + $proto + "%3Blr%3Breceived=" + $si+":"+$sp+"%3E";
         $var(fs_contact) = "<" + $(ct{tobody.uri}) + ";fs_path=" + $var(fs_path) + ">";
@@ -65,7 +76,7 @@ route[HANDLE_SUBSCRIBE]
            $var(fs_contact) = $var(fs_contact) + ";" + $(ct{tobody.params});
         }
 
-        $var(amqp_payload_request) = "{'Event-Category' : 'presence', 'Event-Name' : 'subscription', 'Event-Package' : '" + $hdr(event) + "', 'Expires' : " + $hdr(Expires) + ", 'Queue' : 'BLF-MY_HOSTNAME', 'Server-ID' : 'BLF-MY_HOSTNAME' ,'Contact' : '" + $var(fs_contact) + "', 'Call-ID' : '" + $ci + "', 'From' : '" + $(fu{s.tolower}) +"', 'User' : '" + $(tu{s.tolower}) + "', 'User-Agent' : '" + $ua + "' }";
+        $var(amqp_payload_request) = '{"Event-Category" : "presence", "Event-Name" : "subscription", "Event-Package" : "$hdr(event)", "Expires" : "$var(Expires)", "Queue" : "BLF-MY_HOSTNAME", "Server-ID" : "BLF-MY_HOSTNAME" , "Contact" : "$(ct{s.escape.common})", "Call-ID" : "$ci", "From" : "$fu", "User" : "$tu", "User-Agent" : "$(ua{s.escape.common})" }';
 
         kazoo_publish("dialoginfo_subs", "dialoginfo_subs", $var(amqp_payload_request));