DND Service

This document provides an overview of Plivo’s DND feature for the US long codes and toll-free numbers. For US shortcodes, customers are expected to manage opt-out blocklists on their end. Learn more about managing opt-in for shortcodes here.

For Longcode Numbers

Plivo’s DND feature will stop outbound messages from a specific Plivo number (SRC) to a specific number (DST) when the DST responds with keywords starting with STOP. For example, if Number A sends an inbound message with any of the keywords listed below to Plivo Number B, then any outbound messages from Number B to Number A will be blocked for a period of three months.

Keywords to opt-out

  • STOP
  • END,
  • QUIT,
  • CANCEL,
  • UNSUBSCRIBE,
  • UNSUB &
  • STOP ALL
Note: STOP with trailing spaces and new line characters also triggers the DND block.

HELP/INFO Keywords

Plivo sends automatic messages to end-users who send HELP/INFO keywords in the inbound message. These automated messages read:

"Text "STOP" to stop receiving any messages from this number. Text "START" to start receiving messages again 
from this number."

OPT-IN Feature

To opt back in to receive messages from a blocked number (SRC- Plivo DID), the number which has replied with STOP must send one of the following keywords.

Keywords to opt-in

  • START,
  • YES,
  • RESUME,
  • RESUME ALL,
  • UNSTOP, &
  • GO

Once the number replies with any of the above keywords, it can receive SMS from the Plivo number which was blocked.

For Toll-Free Numbers

Keywords to opt-out

  • “STOP”
  • “Stop”
  • “stop”
  • “STop”

Invalid opt-out examples

  • “Hey, can you stop texting me?”
  • “Stop it!”

The opt-out confirmation message returned to a consumer is generic and provides instructions on how to opt back into service again with the message sender’s phone number.

Opt-out confirmation message

The network message reads as follows:

“You replied with the word "STOP" which blocks all texts sent from this number. Text back "UNSTOP" to receive 
messages again.” 

Opt-In Key Words & Messages

A consumer can opt back in at any time to receive messages by texting the keyword “UNSTOP” to a message sender’s phone number. The keyword is not case sensitive and triggers opt-in only when sent as a single word with no punctuation or leading spaces (any trailing spaces are trimmed). If the consumer uses the opt-in keyword within a sentence, the opt-in is not triggered.

Keywords to opt-in

  • “UNSTOP”
  • “Unstop”
  • “unstop”
  • “UNStop”

Invalid opt-in examples

  • “Hey can you enable me again”
  • “Unstop me!”

The message returned to a consumer is generic and informs the consumer they can start two-way texting with the message sender’s phone number again.

Message text

The network message reads as follows:

“You have replied "unstop" and will begin receiving messages again from this number.”