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A program that requires single opt-in where the mobile subscriber is billed standard SMS rates as per the subscriber’s mobile plan.

The delivery status of a MT message according to the timestamps received from servers in the MT delivery chain.

SIM Tool Kit, or Service Text Messages (the functionality is the same). It is sometimes also called the SIM Application Toolkit. These are binary SMS messages sent to the phone, mainly by Operators but also by our customers, to update the SIM card and/or the phone with service-related information. Examples where STKs are used: - Enable the phone for Internet connectivity - Update prepaid phones - Activate new phones/SIM cards - Upgrade phone ROM/Flash memory software.

In SMPP terms, a “store” is an internal holding place for messages that are unable to be routed either to a supplier/carrier, or to the customer. The message sits in the store until they can be delivered or until they expire.

A Mobile Subscriber is a person who has a mobile phone account with a mobile operator.

Sinch subprojects are a way to group resources together under a parent project.  They can either have separate API credentials or the same credentials as the parent project.

Sinch Voice Application Markup Language (SVAML) is a command language to inform legacy Sinch (Voice) SDKs, it works on the same principal as HTML but is specific to Sinch technology.   Learn more about the Sinch Voice Products.

A sweepstakes is a legal game of chance that includes a prize.

Transmission Control Protocol (TCP) is a standard that defines how to establish and maintain a network conversation through which application programs can exchange data. TCP works with the Internet Protocol (IP), which defines how computers send packets of data to each other.

Training Check Frame (from ITU T.30) – a test frame at the end of the handshake phase that ensures that the modems can communicate at the speed negotiated.

Telephone Consumer Protection Acts a federal statute enacted in 1991 designed to safeguard consumer privacy.

The Campaign Registry (TCR) is a central hub for Application-to-Person (A2P) 10 Digit Long Code (10DLC) messaging campaigns.    Read the What is The Campaign Registry (TCR)? article to learn more.

Time Division Multiple Access (TDMA) is a channel access method for GSM networks. It allows several users to share the same frequency channel by dividing the signal into different time slots.

A Temporary Negative Notification is returned when attempting a retry on a message that previously failed to deliver. In such a case, customers should expect a final status to be sent at the conclusion of the retry process, whether successful or not. Until a final status is received, customers must not initiate their own retry as it could potentially result in duplicate messages arriving at the handset.

A temporary positive notification indicates an interim delivery confirmation to a customer, with a final delivery confirmation yet to be returned.

The terminating operator is an expression used to explain which Mobile Operator’s SMSC delivered a message to a subscriber. For example, sending a message to MTN South Africa via Vodafone UK’s SMSC, we would say Vodafone UK was the terminating operator (or termination operator).

See SMS Message.

Text to Voice is a product used when an SMS message cannot be delivered (or sometimes as a preference). A message will be delivered by calling the number and delivering the message through a voice recording that reads out the contents of the SMS message. This is a useful feature especially for people who have a visual impairment or only have a land line.

Network protocol based on the IEEE 802.15.4 standard, similar to Zigbee, providing IPv6 addressing.

Closely related to throughput, throttle is a technique a server will use to prevent your application from exceeding its allowed throughput. By way of example, if your account is allowed to send at 10 msg/sec, and you try and submit at 20 msg/sec, then the receiving server will throttle your application send rate by either delaying acknowledgement or responding with throttle errors to slow your application down back down to 10 msg/sec.