diff --git a/src/WebRtc/Utils/WebRtcTransfer.php b/src/WebRtc/Utils/WebRtcTransfer.php
index afe6229..80537b9 100644
--- a/src/WebRtc/Utils/WebRtcTransfer.php
+++ b/src/WebRtc/Utils/WebRtcTransfer.php
@@ -10,11 +10,24 @@
 namespace BandwidthLib\WebRtc\Utils;
 
 class WebRtcTransfer {
-    public static function generateBxml($deviceToken, $sipUri = "sip:sipx.webrtc.bandwidth.com:5060") {
-        return '<?xml version="1.0" encoding="UTF-8"?><Response>' . WebRtcTransfer::generateTransferBxmlVerb($deviceToken, $sipUri) . '</Response>';
+    public static function generateBxml($deviceToken, $voiceCallId, $sipUri = "sip:sipx.webrtc.bandwidth.com:5060") {
+        /**
+        * Returns BXML string with WebRTC a device token to perform a SIP transfer
+        * @param    string  $deviceToken  The device token
+        * @param    array   $voiceCallId  The Bandwidth Voice Call Id
+        * @return   string  $sipUri The SIP URI to transfer the call to 
+        */
+        return '<?xml version="1.0" encoding="UTF-8"?><Response>' . WebRtcTransfer::generateTransferBxmlVerb($deviceToken, $voiceCallId, $sipUri) . '</Response>';
     }
 
-    public static function generateTransferBxmlVerb($deviceToken, $sipUri = "sip:sipx.webrtc.bandwidth.com:5060") {
-        return '<Transfer><SipUri uui="' . $deviceToken . ';encoding=jwt">' . $sipUri . '</SipUri></Transfer>'; 
+    public static function generateTransferBxmlVerb($deviceToken, $voiceCallId, $sipUri = "sip:sipx.webrtc.bandwidth.com:5060") {
+        /**
+        * Returns the Transfer verb to perform the SIP transfer
+        * @param    string  $deviceToken  The device token
+        * @param    array   $voiceCallId  The Bandwidth Voice Call Id
+        * @return   string  $sipUri The SIP URI to transfer the call to 
+        */
+        $formattedCallId = substr(str_replace("-", "", $voiceCallId), 1);
+        return '<Transfer><SipUri uui="' . $formattedCallId . ';encoding=base64,' . $deviceToken . ';encoding=jwt">' . $sipUri . '</SipUri></Transfer>'; 
     }
 }
diff --git a/tests/WebRtcBxmlTest.php b/tests/WebRtcBxmlTest.php
index f8cc7ad..64aa7ed 100644
--- a/tests/WebRtcBxmlTest.php
+++ b/tests/WebRtcBxmlTest.php
@@ -13,14 +13,14 @@
 final class WebRtcBxmlTest extends TestCase
 {
     public function testGenerateBxml() {
-        $expected = '<?xml version="1.0" encoding="UTF-8"?><Response><Transfer><SipUri uui="asdf;encoding=jwt">sip:sipx.webrtc.bandwidth.com:5060</SipUri></Transfer></Response>';
-        $actual = BandwidthLib\WebRtc\Utils\WebRtcTransfer::generateBxml('asdf');
+        $expected = '<?xml version="1.0" encoding="UTF-8"?><Response><Transfer><SipUri uui="93d6f3c0be5845960b744fa28015d8ede84bd1a4;encoding=base64,asdf;encoding=jwt">sip:sipx.webrtc.bandwidth.com:5060</SipUri></Transfer></Response>';
+        $actual = BandwidthLib\WebRtc\Utils\WebRtcTransfer::generateBxml('asdf', 'c-93d6f3c0-be584596-0b74-4fa2-8015-d8ede84bd1a4');
         $this->assertEquals($expected, $actual);
     }
 
     public function testGenerateTransferBxmlVerb() {
-        $expected = '<Transfer><SipUri uui="asdf;encoding=jwt">sip:sipx.webrtc.bandwidth.com:5060</SipUri></Transfer>';
-        $actual = BandwidthLib\WebRtc\Utils\WebRtcTransfer::generateTransferBxmlVerb('asdf');
+        $expected = '<Transfer><SipUri uui="93d6f3c0be5845960b744fa28015d8ede84bd1a4;encoding=base64,asdf;encoding=jwt">sip:sipx.webrtc.bandwidth.com:5060</SipUri></Transfer>';
+        $actual = BandwidthLib\WebRtc\Utils\WebRtcTransfer::generateTransferBxmlVerb('asdf', 'c-93d6f3c0-be584596-0b74-4fa2-8015-d8ede84bd1a4');
         $this->assertEquals($expected, $actual);
     }
 }