diff --git a/sdk/communication/Azure.Communication.CallAutomation/src/CallAutomationClient.cs b/sdk/communication/Azure.Communication.CallAutomation/src/CallAutomationClient.cs
index 5913ea29e2fd..36e38e5f58e9 100644
--- a/sdk/communication/Azure.Communication.CallAutomation/src/CallAutomationClient.cs
+++ b/sdk/communication/Azure.Communication.CallAutomation/src/CallAutomationClient.cs
@@ -62,6 +62,17 @@ public CallAutomationClient(Uri endpoint, TokenCredential credential, CallAutoma
                 Argument.CheckNotNull(credential, nameof(credential)),
                 options ?? new CallAutomationClientOptions())
         { }
+
+        /// <summary> Initializes a new instance of <see cref="CallAutomationClient"/> with custom PMA endpoint.</summary>
+        /// <param name="pmaEndpoint">Endpoint for PMA</param>
+        /// <param name="connectionString">Connection string acquired from the Azure Communication Services resource.</param>
+        /// <param name="options">Client option exposing <see cref="ClientOptions.Diagnostics"/>, <see cref="ClientOptions.Retry"/>, <see cref="ClientOptions.Transport"/>, etc.</param>
+        public CallAutomationClient(Uri pmaEndpoint, string connectionString, CallAutomationClientOptions options = default)
+        : this(
+              pmaEndpoint,
+              options ?? new CallAutomationClientOptions(),
+              ConnectionString.Parse(connectionString))
+        { }
         #endregion
 
         #region private constructors
@@ -85,6 +96,13 @@ private CallAutomationClient(Uri endpoint, HttpPipeline httpPipeline, CallAutoma
             EventProcessor = new CallAutomationEventProcessor();
             Source = options.Source;
         }
+
+        private CallAutomationClient(Uri endpoint, CallAutomationClientOptions options, ConnectionString connectionString)
+        : this(
+        endpoint: endpoint,
+        httpPipeline: options.CustomBuildHttpPipeline(connectionString),
+        options: options)
+        { }
         #endregion
 
         /// <summary>Initializes a new instance of <see cref="CallAutomationClient"/> for mocking.</summary>
diff --git a/sdk/communication/Azure.Communication.CallAutomation/src/CallAutomationClientOptions.cs b/sdk/communication/Azure.Communication.CallAutomation/src/CallAutomationClientOptions.cs
index 065865ae72f1..96d212f23936 100644
--- a/sdk/communication/Azure.Communication.CallAutomation/src/CallAutomationClientOptions.cs
+++ b/sdk/communication/Azure.Communication.CallAutomation/src/CallAutomationClientOptions.cs
@@ -34,9 +34,9 @@ public CallAutomationClientOptions(ServiceVersion version = LatestVersion)
             {
                 ServiceVersion.V2023_03_06 => "2023-03-06",
                 ServiceVersion.V2023_10_15 => "2023-10-15",
-                ServiceVersion.V2024_04_15 => "2024_04_15",
-                ServiceVersion.V2024_09_15 => "2024_09_15",
-                ServiceVersion.V2025_05_15 => "2025_05_15",
+                ServiceVersion.V2024_04_15 => "2024-04-15",
+                ServiceVersion.V2024_09_15 => "2024-09-15",
+                ServiceVersion.V2025_05_15 => "2025-05-15",
                 _ => throw new ArgumentOutOfRangeException(nameof(version)),
             };
         }