diff --git a/package.json b/package.json
index 4b0a5a0..a56568e 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,8 @@
     "node": ">=0.2.2"
   },
   "dependencies": {
-    "ws": "*"
+    "ws": "*",
+    "node-uuid": "*"
   },
   "devDependencies": {
     "coffee-script": "~1.6.2"
diff --git a/sip.js b/sip.js
index 2eda916..c1e8456 100644
--- a/sip.js
+++ b/sip.js
@@ -899,8 +899,10 @@ function resolve(uri, action) {
 exports.resolve = resolve;
 
 //transaction layer
+var uuid = require('node-uuid');
 function generateBranch() {
-  return ['z9hG4bK',Math.round(Math.random()*1000000)].join('');
+  var buffer = new Buffer(16);
+  return ['z9hG4bK',uuid.v4({}, buffer).toString('hex')].join('');
 }
 
 exports.generateBranch = generateBranch;