diff --git a/lib/sip-trunk-register.js b/lib/sip-trunk-register.js
index 5102189..81fb392 100644
--- a/lib/sip-trunk-register.js
+++ b/lib/sip-trunk-register.js
@@ -177,7 +177,7 @@ class Regbot {
             expires = MIN_EXPIRES;
           }
           debug(`setting timer for next register to ${expires} seconds`);
-          this.timer = setTimeout(this.register.bind(this, srf), (expires - 5) * 1000);
+          this.timer = setTimeout(this.register.bind(this, srf), (expires / 2) * 1000);
         }
         updateVoipCarriersRegisterStatus(this.voip_carrier_sid, JSON.stringify({
           status: res.status === 200 ? 'ok' : 'fail',