diff --git a/RELEASE b/RELEASE
index 3c517b0..b14b192 100644
--- a/RELEASE
+++ b/RELEASE
@@ -1,3 +1,7 @@
+2.2.2
+
+- Fixed issue handling empty parameters for application/json content-type
+
 2.2.1
 
 - Added support for application/json content-type
diff --git a/lib/telesign/rest.rb b/lib/telesign/rest.rb
index 96ee831..77bb912 100644
--- a/lib/telesign/rest.rb
+++ b/lib/telesign/rest.rb
@@ -7,7 +7,7 @@
 require 'net/http/persistent'
 
 module Telesign
-  SDK_VERSION = '2.2.1'
+  SDK_VERSION = '2.2.2'
 
   # The TeleSign RestClient is a generic HTTP REST client that can be extended to make requests against any of
   # TeleSign's REST API endpoints.
@@ -18,7 +18,7 @@ module Telesign
   # See https://developer.telesign.com for detailed API documentation.
   class RestClient
 
-    @user_agent = "TeleSignSDK/ruby-{#{SDK_VERSION} #{RUBY_DESCRIPTION} net/http/persistent"
+    @@user_agent = "TeleSignSDK/ruby-{#{SDK_VERSION} #{RUBY_DESCRIPTION} net/http/persistent"
 
     # A simple HTTP Response object to abstract the underlying net/http library response.
 
@@ -194,20 +194,20 @@ def execute(method_function, method_name, resource, **params)
 
       request = method_function.new(resource_uri.request_uri)
 
-      unless params.empty?
-        if %w[POST PUT].include? method_name
-          if content_type == "application/x-www-form-urlencoded"
+      encoded_fields = ''
+      if %w[POST PUT].include? method_name
+        if content_type == "application/x-www-form-urlencoded"
+          unless params.empty?
             encoded_fields = URI.encode_www_form(params, Encoding::UTF_8)
             request.set_form_data(params)
-          else
-            encoded_fields = params.to_json
-            request.body = encoded_fields
-            request.set_content_type("application/json")
           end
         else
-          encoded_fields = []
-          resource_uri.query = URI.encode_www_form(params, Encoding::UTF_8)
+          encoded_fields = params.to_json
+          request.body = encoded_fields
+          request.set_content_type("application/json")
         end
+      else
+        resource_uri.query = URI.encode_www_form(params, Encoding::UTF_8)
       end
 
       headers = RestClient.generate_telesign_headers(@customer_id,
@@ -216,7 +216,7 @@ def execute(method_function, method_name, resource, **params)
                                                      resource,
                                                      content_type,
                                                      encoded_fields,
-                                                     user_agent: @user_agent)
+                                                     user_agent: @@user_agent)
 
       headers.each do |k, v|
         request[k] = v
diff --git a/telesign.gemspec b/telesign.gemspec
index 68a6ff9..16fea16 100644
--- a/telesign.gemspec
+++ b/telesign.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name                    = 'telesign'
-  s.version                 = '2.2.1'
+  s.version                 = '2.2.2'
   s.licenses                = ['MIT']
   s.date                    = '2017-05-25'
   s.summary                 = 'TeleSign Ruby SDK'
diff --git a/test/test_rest.rb b/test/test_rest.rb
index df260cf..554010f 100644
--- a/test/test_rest.rb
+++ b/test/test_rest.rb
@@ -202,4 +202,36 @@ def test_rest_client_delete
     assert_requested :delete, 'http://localhost/test/resource', headers: {'x-ts-nonce' => /.*\S.*/}
     assert_requested :delete, 'http://localhost/test/resource', headers: {'Date' => /.*\S.*/}
   end
+
+  def test_phoneid
+    stub_request(:post, 'localhost/v1/phoneid/1234567890').to_return(body: '{}')
+
+    client = Telesign::PhoneIdClient::new(@customer_id,
+                                          @api_key,
+                                          rest_endpoint: 'http://localhost')
+    client.phoneid('1234567890')
+    
+    assert_requested :post, 'http://localhost/v1/phoneid/1234567890'
+    assert_requested :post, 'http://localhost/v1/phoneid/1234567890', body: '{}'
+    assert_requested :post, 'http://localhost/v1/phoneid/1234567890', headers: {'Content-Type' => 'application/json'}
+    assert_requested :post, 'http://localhost/v1/phoneid/1234567890', headers: {'x-ts-auth-method' => 'HMAC-SHA256'}
+    assert_requested :post, 'http://localhost/v1/phoneid/1234567890', headers: {'x-ts-nonce' => /.*\S.*/}
+    assert_requested :post, 'http://localhost/v1/phoneid/1234567890', headers: {'Date' => /.*\S.*/}
+  end
+
+  def test_phoneid_with_addons
+    stub_request(:post, 'localhost/v1/phoneid/1234567890').to_return(body: '{}')
+
+    client = Telesign::PhoneIdClient::new(@customer_id,
+                                          @api_key,
+                                          rest_endpoint: 'http://localhost')
+    client.phoneid('1234567890', addons: {'contact': {}})
+
+    assert_requested :post, 'http://localhost/v1/phoneid/1234567890'
+    assert_requested :post, 'http://localhost/v1/phoneid/1234567890', body: '{"addons":{"contact":{}}}'
+    assert_requested :post, 'http://localhost/v1/phoneid/1234567890', headers: {'Content-Type' => 'application/json'}
+    assert_requested :post, 'http://localhost/v1/phoneid/1234567890', headers: {'x-ts-auth-method' => 'HMAC-SHA256'}
+    assert_requested :post, 'http://localhost/v1/phoneid/1234567890', headers: {'x-ts-nonce' => /.*\S.*/}
+    assert_requested :post, 'http://localhost/v1/phoneid/1234567890', headers: {'Date' => /.*\S.*/}
+  end
 end