handle deregistrations in keepalive

kamailio/keepalive.cfg

@@ -160,8 +160,12 @@ route[KEEPALIVE_ON_REGISTRATION]
    $var(local_contact) = "sip:" + $Ri + ":" + $Rp + ";transport=" + $proto;
    xlog("L_DEBUG", "$ci|keepalive|KEEPALIVE ON REG $var(save_result) $proto $RAut $var(contact) $var(alias) $(ct{nameaddr.uri}) $ct $avp(AVP_RECV_PARAM) $tu $xavp(ulrcd=>ruid) , $xavp(ulrcd=>contact) , $xavp(ulrcd=>expires)\n");
 
-   $var(slot) = $(var(contact){s.corehash, KEEPALIVE_S_TIMERS});
-   $var(sql) = $_s(INSERT OR IGNORE INTO keepalive (contact, sockinfo, slot) values("$var(contact)", "$(RAut{uri.tosocket})", $var(slot)));
+   if($var(save_result) == 3) {
+        $var(sql) = $_s(DELETE FROM keepalive WHERE contact = "$var(contact)");
+   } else {
+        $var(slot) = $(var(contact){s.corehash, KEEPALIVE_S_TIMERS});
+        $var(sql) = $_s(INSERT OR IGNORE INTO keepalive (contact, sockinfo, slot) values("$var(contact)", "$(RAut{uri.tosocket})", $var(slot)));
+   }
    mq_add("keepalive_db_queue", "$ci", "$var(sql)");
 
    return;