article US A2P - Supported Message Sender Types in SMS https://community.sinch.com/t5/SMS/US-A2P-Supported-Message-Sender-Types/ta-p/9018 <DIV class="lia-message-template-question-zone"> <H3>What Senders (Originators, Numbers) are supported in the US for A2P SMS/MMS Services?</H3> <P>&nbsp;</P> </DIV> <DIV class="lia-message-template-answer-zone"> <P>All A2P Senders in the US are Dedicated 2-way Products.&nbsp; They all require some level of registration for the Brand (Sender) to the number(s).&nbsp; They all must support/respond accordingly to mandatory Keywords for STOP (Opt-out) and HELP (Customer Support).&nbsp; Supported Originators are Short Code, 10DLC (Local Numbers) and Toll Free Numbers (TFN).&nbsp; Alpha is not supported today.</P> <P>&nbsp;</P> <P><EM>Take a look at the&nbsp;<A href="https://www.sinch.com/products/apis/messaging/sms/" target="_blank" rel="noopener noreferrer">Sinch SMS Product page</A>&nbsp;to learn more about our SMS products, or click&nbsp;<A href="https://www.sinch.com/sign-up/" target="_blank" rel="noopener noreferrer">here</A>&nbsp;to sign up to our self-service portal and get started today.</EM></P> </DIV> Fri, 25 Jul 2025 11:03:11 GMT Jonathan_Vimont 2025-07-25T11:03:11Z US A2P - Supported Message Sender Types https://community.sinch.com/t5/SMS/US-A2P-Supported-Message-Sender-Types/ta-p/9018 <DIV class="lia-message-template-question-zone"> <H3>What Senders (Originators, Numbers) are supported in the US for A2P SMS/MMS Services?</H3> <P>&nbsp;</P> </DIV> <DIV class="lia-message-template-answer-zone"> <P>All A2P Senders in the US are Dedicated 2-way Products.&nbsp; They all require some level of registration for the Brand (Sender) to the number(s).&nbsp; They all must support/respond accordingly to mandatory Keywords for STOP (Opt-out) and HELP (Customer Support).&nbsp; Supported Originators are Short Code, 10DLC (Local Numbers) and Toll Free Numbers (TFN).&nbsp; Alpha is not supported today.</P> <P>&nbsp;</P> <P><EM>Take a look at the&nbsp;<A href="https://www.sinch.com/products/apis/messaging/sms/" target="_blank" rel="noopener noreferrer">Sinch SMS Product page</A>&nbsp;to learn more about our SMS products, or click&nbsp;<A href="https://www.sinch.com/sign-up/" target="_blank" rel="noopener noreferrer">here</A>&nbsp;to sign up to our self-service portal and get started today.</EM></P> </DIV> Fri, 25 Jul 2025 11:03:11 GMT https://community.sinch.com/t5/SMS/US-A2P-Supported-Message-Sender-Types/ta-p/9018 Jonathan_Vimont 2025-07-25T11:03:11Z