diff --git a/CHANGELOG.md b/CHANGELOG.md
index 03427db2d..8aba9e4ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Added missing fields to Application, capabilities and webhooks
 - Removed `PageList` (replaced by `HalPageResponse`)
 - Improved documentation for Application API implementation
+- Relaxed UUID validation in `VoiceClient`
 
 # [7.6.0] - 2023-06-30
 - Added Proactive Connect API implementation
diff --git a/src/main/java/com/vonage/client/voice/VoiceClient.java b/src/main/java/com/vonage/client/voice/VoiceClient.java
index 76adaf3cf..17ef78007 100644
--- a/src/main/java/com/vonage/client/voice/VoiceClient.java
+++ b/src/main/java/com/vonage/client/voice/VoiceClient.java
@@ -23,7 +23,6 @@
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.Objects;
-import java.util.UUID;
 
 /**
  * A client for talking to the Vonage Voice API. The standard way to obtain an instance of this class is to use {@link
@@ -60,7 +59,7 @@ public VoiceClient(HttpWrapper httpWrapper) {
     }
 
     private String validateUuid(String uuid) {
-        return UUID.fromString(Objects.requireNonNull(uuid, "UUID is required.")).toString();
+        return Objects.requireNonNull(uuid, "UUID is required.");
     }
 
     private String validateUrl(String url) {
diff --git a/src/test/java/com/vonage/client/voice/VoiceClientTest.java b/src/test/java/com/vonage/client/voice/VoiceClientTest.java
index 94c6f5511..98347618c 100644
--- a/src/test/java/com/vonage/client/voice/VoiceClientTest.java
+++ b/src/test/java/com/vonage/client/voice/VoiceClientTest.java
@@ -136,9 +136,7 @@ public void testSendDtmf() throws Exception {
         assertThrows(IllegalArgumentException.class, () ->
                 client.sendDtmf("944dd293-ca13-4a58-bc37-6252e11474be", null)
         );
-        assertThrows(IllegalArgumentException.class, () ->
-                client.sendDtmf("invalid", "1234")
-        );
+        assertThrows(NullPointerException.class, () -> client.sendDtmf(null, "1234"));
     }
 
     @Test
@@ -146,7 +144,7 @@ public void testModifyCall() throws Exception {
         VoiceClient client = new VoiceClient(stubHttpWrapper(200, "{\"message\":\"Received\"}"));
         ModifyCallResponse call = client.modifyCall("93137ee3-580e-45f7-a61a-e0b5716000ef", ModifyCallAction.HANGUP);
         assertEquals("Received", call.getMessage());
-        assertThrows(IllegalArgumentException.class, () -> client.modifyCall("invalid", ModifyCallAction.HANGUP));
+        assertThrows(NullPointerException.class, () -> client.modifyCall(null, ModifyCallAction.HANGUP));
         assertThrows(NullPointerException.class, () ->
                 client.modifyCall("93137ee3-580e-45f7-a61a-e0b5716000ef", null)
         );
@@ -352,7 +350,7 @@ public void testStopTalk() throws Exception {
         TalkResponse response = client.stopTalk("944dd293-ca13-4a58-bc37-6252e11474be");
         assertEquals("Talk stopped", response.getMessage());
         assertEquals("944dd293-ca13-4a58-bc37-6252e11474be", response.getUuid());
-        assertThrows(IllegalArgumentException.class, () -> client.stopTalk("Blah"));
+        assertThrows(NullPointerException.class, () -> client.stopTalk(null));
     }
 
     @Test