diff --git a/lib/sip-trunk-register.js b/lib/sip-trunk-register.js
index e17e31b..8f54c95 100644
--- a/lib/sip-trunk-register.js
+++ b/lib/sip-trunk-register.js
@@ -131,7 +131,7 @@ class Regbot {
         proxy,
         headers: {
           'From': this.from,
-          'Contact': `<${scheme}:${contactAddress}>;transport=${transport};expires=${DEFAULT_EXPIRES}`,
+          'Contact': `<${scheme}:${contactAddress};transport=${transport}>;expires=${DEFAULT_EXPIRES}`,
           'Expires': DEFAULT_EXPIRES
         },
         auth: {