Update opt-in form compliance details in SMS errors

Clarified compliance details regarding the opt-in form and CTIA guidelines.

Author: Cloud-Writer

Teams/phone-system/sms-calling-errors.md

@@ -41,7 +41,7 @@ The following sections provide a comprehensive list of potential rejection error
 | CallToActionMissingMessageType | The Call to Action doesn't mention the kinds of messages that a customer can expect to receive. | Specify the kinds of messages that users might receive. |
 | CallToActionOptInIssues | The opt-in URL is inaccessible or returns a certificate error. | Make sure that the opt-in URL is valid and secure. |
 | CallToActionInvalidOrIncomplete | The Call to Action is noncompliant or incomplete. | Make sure that all required elements are present: brand name, HELP, STOP, frequency, fees, and privacy policy. |
-| CallToActionMissingOptInForm | The Call to Action page does not include an opt-in form for users to provide consent. | Add a visible and functional opt-in form to the CTA page. Make sure that it collects explicit consent, and complies with [CTIA guidelines](https://api.ctia.org/wp-content/uploads/2023/05/230523-CTIA-Messaging-Principles-and-Best-Practices-FINAL.pdf). |
+| CallToActionMissingOptInForm | The Call to Action page does not include an opt-in form for users to provide consent. | Add a visible and functional opt-in form to the CTA page. Make sure that it collects explicit consent, and complies with the Cellular Telecommunications Industry Association [CTIA guidelines](https://api.ctia.org/wp-content/uploads/2023/05/230523-CTIA-Messaging-Principles-and-Best-Practices-FINAL.pdf). |
 | CallToActionConsentNotOptional | SMS consent is mandatory on a multipurpose form. This status means that users cannot opt out of SMS while they complete other actions. | Update the form so that SMS consent is presented as an optional checkbox (not pre-selected), and is independent of other actions.|
 | CallToActionVerificationIssues | The opt-in process cannot be verified because of missing confirmation steps, timestamps, or verification records. | Implement a confirmation step (e.g., "Thank you for opting in" message), and make sure that timestamps are logged for compliance audits.|