diff --git a/client/src/main/com/sinch/sdk/domains/voice/models/v1/calls/response/CallInformationFrom.java b/client/src/main/com/sinch/sdk/domains/voice/models/v1/calls/response/CallInformationFrom.java
index a7e1d9f2..3c3f413a 100644
--- a/client/src/main/com/sinch/sdk/domains/voice/models/v1/calls/response/CallInformationFrom.java
+++ b/client/src/main/com/sinch/sdk/domains/voice/models/v1/calls/response/CallInformationFrom.java
@@ -1,3 +1,9 @@
 package com.sinch.sdk.domains.voice.models.v1.calls.response;
 
+/**
+ * Class related to a <code>From</code> destination for {@link CallInformation#getFrom()}
+ *
+ * @see com.sinch.sdk.domains.voice.api.v1.CallsService#get(String)
+ * @since 1.4
+ */
 public interface CallInformationFrom {}
diff --git a/client/src/main/com/sinch/sdk/domains/voice/models/v1/calls/response/CallInformationTo.java b/client/src/main/com/sinch/sdk/domains/voice/models/v1/calls/response/CallInformationTo.java
index af2b1d75..232f4248 100644
--- a/client/src/main/com/sinch/sdk/domains/voice/models/v1/calls/response/CallInformationTo.java
+++ b/client/src/main/com/sinch/sdk/domains/voice/models/v1/calls/response/CallInformationTo.java
@@ -1,3 +1,9 @@
 package com.sinch.sdk.domains.voice.models.v1.calls.response;
 
+/**
+ * Class related to a <code>To</code> destination for {@link CallInformation#getTo()}
+ *
+ * @see com.sinch.sdk.domains.voice.api.v1.CallsService#get(String)
+ * @since 1.4
+ */
 public interface CallInformationTo {}
diff --git a/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/Destination.java b/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/Destination.java
index df93e66f..104c9816 100644
--- a/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/Destination.java
+++ b/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/Destination.java
@@ -1,3 +1,8 @@
 package com.sinch.sdk.domains.voice.models.v1.destination;
 
+/**
+ * Base class related to a <code>Destination</code>
+ *
+ * @since 1.4
+ */
 public interface Destination {}
diff --git a/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/DestinationConference.java b/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/DestinationConference.java
index 8d90b1a9..8e3ccf0a 100644
--- a/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/DestinationConference.java
+++ b/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/DestinationConference.java
@@ -1,3 +1,11 @@
 package com.sinch.sdk.domains.voice.models.v1.destination;
 
+import com.sinch.sdk.domains.voice.models.v1.callouts.request.CalloutRequestConference;
+
+/**
+ * Base class related to a <code>Conference</code> call destination
+ *
+ * @see com.sinch.sdk.domains.voice.api.v1.CalloutsService#conference(CalloutRequestConference)
+ * @since 1.4
+ */
 public interface DestinationConference {}
diff --git a/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/DestinationCustom.java b/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/DestinationCustom.java
index a020ca33..7660ba3e 100644
--- a/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/DestinationCustom.java
+++ b/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/DestinationCustom.java
@@ -1,3 +1,11 @@
 package com.sinch.sdk.domains.voice.models.v1.destination;
 
+import com.sinch.sdk.domains.voice.models.v1.callouts.request.CalloutRequestCustom;
+
+/**
+ * Base class related to a <code>Custom</code> call destination
+ *
+ * @see com.sinch.sdk.domains.voice.api.v1.CalloutsService#custom(CalloutRequestCustom)
+ * @since 1.4
+ */
 public interface DestinationCustom {}
diff --git a/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/DestinationTextToSpeech.java b/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/DestinationTextToSpeech.java
index 1768632a..529858ec 100644
--- a/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/DestinationTextToSpeech.java
+++ b/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/DestinationTextToSpeech.java
@@ -1,3 +1,11 @@
 package com.sinch.sdk.domains.voice.models.v1.destination;
 
+import com.sinch.sdk.domains.voice.models.v1.callouts.request.CalloutRequestTTS;
+
+/**
+ * Base class related to a <code>Text To Speech</code> call destination
+ *
+ * @see com.sinch.sdk.domains.voice.api.v1.CalloutsService#textToSpeech(CalloutRequestTTS)
+ * @since 1.4
+ */
 public interface DestinationTextToSpeech {}
diff --git a/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/package-info.java b/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/package-info.java
new file mode 100644
index 00000000..eb44073a
--- /dev/null
+++ b/client/src/main/com/sinch/sdk/domains/voice/models/v1/destination/package-info.java
@@ -0,0 +1,6 @@
+/**
+ * Destination related classes
+ *
+ * @since 1.4
+ */
+package com.sinch.sdk.domains.voice.models.v1.destination;