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Validity period is an optional value that can be set on a per message basis to control how long an SMSC should attempt to deliver an SMS message. It is usually only useful when a destination recipient handset is turned off or out of coverage, and an SMS message is time critical. The value of the validity period is the “number of minutes” from the time the SMS message is submitted, until it should expire. The value may be specified as an absolute (date and time to the second) or relative (indicated in HHMMSS). When this time is reached, an SMSC would generally return an expired delivery report.   If no validity period is set, the Sinch SMSC default is used which is 2 days (2,880 minutes). For example - setting the validity period to 30 would result in an SMS message only being retried for delivery by an SMSC for a maximum of 30 minutes.

Services such as news on demand, pictures of the day, and the like that are provided by VASPs. Also referred to as VAS.

A third-party providing MMS VAS by sending content over multimedia messages and processing requests sent from subscribers over multimedia messages. Also referred to as VASP.

The Sinch Customer Dashboard allows you to add a verified number, which is typically your own number or the number of trusted testers. Using a verified number helps prevent others from using a number they don’t own by associating it with your account. It can also help prevent fraud during the registration process.   Click here to learn more about how you can get access to a complete range of carefully-tested phone numbers, to use with all your communication services from Sinch.

The vetting score is associated with 10DLC numbers that are fully registered through The Campaign Registry (TCR). Depending on your business type and uses for messaging or voice, you will be assigned a score ranging from 1-100. The higher the score, the more throughput.   Refer to the  TRC’s Quick Start Guide to learn more about vetting.   Visit the 10DLC Product Page to learn more. If you need help with 10DLC or have any questions, contact Sinch, who will be happy help!

Also called a DID number, it is a telephone number that is not locked down to a specific phoneline.   Learn how to buy a virtual number.

Enables you to receive text message from anyone. Virtual SMS makes it possible to send SMS over the internet without having to use a physical phone.

Visitor Location Register (VLR) is a database which stores information about mobile phones that have recently joined a particular area of a mobile operator’s network. It plays a vital role in keeping track of roamed mobile phone subscribers and co-ordinates with the HLR to determine whether the mobile is a permanent subscriber or a temporary one. Whenever a Mobile Switch Center (MSC) detects a new mobile in its network, in addition to creating a new record in the VLR, it also updates the HLR of the mobile subscriber, apprising it of the new location of that mobile (the MSC address). The MSC address received during an HLR lookup for a particular mobile number is useful for identifying numbers roaming in another country. The foreign network that the number is logged onto can also be identified using this data.

Voice over Internet Protocol (VoIP) is a technology used for the delivery of voice communications (that is, talking) over the internet.

A Virtual Private Network extends a private network across a public network and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network.

Very Small Aperture Terminal (VSAT) is a satellite communication technology using small dish antennas for narrowband and broadband.

Virtual Subscription Database. This is used by Operators to stop SMS spam (the end users have to be subscribed before messages can be sent to them).