diff --git a/src/main/java/cli/Main.java b/src/main/java/cli/Main.java
index 34f07a55..18a9c57a 100644
--- a/src/main/java/cli/Main.java
+++ b/src/main/java/cli/Main.java
@@ -17,6 +17,7 @@
 package cli;
 
 import net.sourceforge.argparse4j.ArgumentParsers;
+import net.sourceforge.argparse4j.impl.Arguments;
 import net.sourceforge.argparse4j.inf.*;
 import org.apache.commons.io.IOUtils;
 import org.whispersystems.libaxolotl.InvalidVersionException;
@@ -43,9 +44,12 @@ public class Main {
                 .description("valid subcommands")
                 .help("additional help");
         Subparser parserRegister = subparsers.addParser("register");
+        parserRegister.addArgument("-v", "--voice")
+                    .help("The verification should be done over voice, not sms.")
+                    .action(Arguments.storeTrue());
         Subparser parserVerify = subparsers.addParser("verify");
         parserVerify.addArgument("verificationCode")
-                .help("The verification code you received via sms.");
+                .help("The verification code you received via sms or voice call.");
         Subparser parserSend = subparsers.addParser("send");
         parserSend.addArgument("recipient")
                 .help("Specify the recipients' phone number.")
@@ -80,7 +84,7 @@ public class Main {
                     m.createNewIdentity();
                 }
                 try {
-                    m.register();
+                    m.register(ns.getBoolean("voice"));
                 } catch (IOException e) {
                     System.out.println("Request verify error: " + e.getMessage());
                     System.exit(3);
diff --git a/src/main/java/cli/Manager.java b/src/main/java/cli/Manager.java
index 97070c97..9487da59 100644
--- a/src/main/java/cli/Manager.java
+++ b/src/main/java/cli/Manager.java
@@ -115,18 +115,22 @@ public class Manager {
         return registered;
     }
 
-    public void register() throws IOException {
+    public void register(boolean voiceVerication) throws IOException {
         password = Util.getSecret(18);
+        signalingKey = Util.getSecret(52);
 
         accountManager = new TextSecureAccountManager(URL, TRUST_STORE, username, password);
 
-        accountManager.requestSmsVerificationCode();
+        if (voiceVerication)
+            accountManager.requestVoiceVerificationCode();
+        else
+            accountManager.requestSmsVerificationCode();
+
         registered = false;
     }
 
     public void verifyAccount(String verificationCode) throws IOException {
         verificationCode = verificationCode.replace("-", "");
-        signalingKey = Util.getSecret(52);
         accountManager.verifyAccount(verificationCode, signalingKey, false, axolotlStore.getLocalRegistrationId());
 
         //accountManager.setGcmId(Optional.of(GoogleCloudMessaging.getInstance(this).register(REGISTRATION_ID)));