Update recommendations for test lines for Azure Communications Gateway

Author: rcdun

articles/communications-gateway/prepare-to-deploy.md

@@ -19,7 +19,12 @@ You must have signed an Operator Connect agreement with Microsoft. For more info
 
 You need an onboarding partner for integrating with Microsoft Phone System. If you're not eligible for onboarding to Microsoft Teams through Azure Communications Gateway's [Basic Integration Included Benefit](onboarding.md) or you haven't arranged alternative onboarding with Microsoft through a separate arrangement, you need to arrange an onboarding partner yourself.
 
-You must ensure you've got two or more numbers that you own which are globally routable. Your onboarding team needs these numbers to configure test lines.
+You must own globally routable numbers that you can use for testing, as follows.
+
+|Type of testing|Numbers required |
+|---------|---------|
+|Automated validation testing by Microsoft Teams test suites|Minimum: 3. Recommended: 6 (to run tests simultaneously).|
+|Manual test calls made by you and/or Microsoft staff during integration testing |Minimum: 1|
 
 We strongly recommend that you have a support plan that includes technical support, such as [Microsoft Unified Support](https://www.microsoft.com/en-us/unifiedsupport/overview) or [Premier Support](https://www.microsoft.com/en-us/unifiedsupport/premier).
 
@@ -100,13 +105,16 @@ Collect all of the values in the following table for both service regions in whi
 
 ## 6. Collect Test Lines configuration values
 
-Collect all of the values in the following table for all test lines you want to configure for Azure Communications Gateway. You must configure at least one test line.
+Collect all of the values in the following table for all the test lines that you want to configure for Azure Communications Gateway.
 
  |**Value**|**Field name(s) in Azure portal**|
  |---------|---------|
  |The name of the test line. |**Name**|
- |The phone number of the test line. |**Phone Number**|
- |Whether the test line is manual or automated: **Manual** test lines will be used by you and Microsoft staff to make test calls during integration testing. **Automated** test lines will be assigned to Microsoft Teams test suites for validation testing. |**Testing purpose**|
+ |The phone number of the test line, in E.164 format and including the country code. |**Phone Number**|
+ |The purpose of the test line: **Manual** (for manual test calls by you and/or Microsoft staff during integration testing) or **Automated** (for automated validation with Microsoft Teams test suites).|**Testing purpose**|
+
+> [!IMPORTANT]
+> You must configure at least three automated test lines. We recommend six automated test lines (to allow simultaneous tests).
 
 ## 7. Decide if you want tags