Glossary
Comprehensive glossary of mobile industry terminology
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A data call is a phone call over the internet, also known as VoIP.
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Daily  Active Users  - the number of users who use the app or service at least once per day.  Contrasts to Monthly Active Users (MAU) – a measurement of monthly usage.
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Disconnect (from ITU T.30) – signals a graceful hang up.
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Data Coding Schema - This is a method to define what character encoding is being used.
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Digital Command Signal (from ITU T.30) -  the sender’s response to the DIS, communicates the sender’s capabilities and negotiates a compatible connection.
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Phone numbers that a mobile operator has taken out of service for an end user, the reason for that can be that the end user has switched operators or has closed their account.
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A report that is issued by certain mobile operators with information about recently deactivated numbers in the USA.
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The process of running only one service on a Common Short Code at any given time.
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Delivery Notifications are message acknowledgments. When delivering messages through the Digital Interconnect network, customers can request to receive the following types of message acknowledgment: Digital Interconnect Ack, SMS-C Ack, Handset Ack. For unsuccessful delivery attempts, a negative acknowledgment (Nack) is returned outlining the reason for failure. Note: Delivery notifications are an operator-dependent feature, and that not all operators support handset acknowledgments.
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When sending an SMS, most mobile operators will return a notification called a delivery receipt to let the sender know whether or not the message was delivered to the handset. Some Short Message Service Centers (SMSCs) will return a delivery receipt when a message has been accepted or if the message is buffered in the SMSC, for example if the handset is switched off, although not ideal this is sometimes unavoidable due to operator's restrictions.   DLR SMS DLR SMS / Delivery Receipt is a feature of the Sinch system that acknowledges receipt of SMS/MMS messages in downstream systems and sometimes even receipt on a handset if the corresponding carrier(s) sends acknowledgement of receipt. Typically DLRs are shared using a series of designated codes assigned to indicate success or a range of causes for failure. Delivery Receipts (DLR) add two new states to the messaging lifecycle – delivered and not delivered. When a message is sent, it is sent by the SMPP gateway to the SMSC with the delivery receipt value set. The SMSC will return the final disposition of the message as determined by the carrier. The app platform will send a new event on delivery receipt based on the value of the new messages parameter, receipt requested. The event will initially only be delivered on failure, but will eventually allow an event for every receipt on every message.   What are the Benefits DLRs? DLR services allow a business to confirm that their message(s) have reached the intended end user. This feature is highly beneficial for businesses that rely on SMS/MMS outreach in order to get in contact with their customers. It can also provide troubleshooting if the message is not successfully delivered to the end user. Delivery Receipts give our customers confidence that their investment in SMS/MMS outreach is being used to its fullest potential to benefit their business.   Learn more out Sinch SMS Services.  
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If an SMS is not delivered (even after the SMSC retry cycle is complete) then a delivery receipt, with an error code indicating why the message failed will be sent. A complete list of delivery receipt error codes can be found in our Developer documentation.
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Connection to a specific country by operator or route.
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A destination number is the phone number of the recipient you wish to send a message to.
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The destination operator is the operator to which the subscriber’s handset is attached. In most cases the destination operator is the home network but when a subscriber is roaming, then the destination operator will be the network on which the subscriber is roaming.
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A synonym for country code (CC).
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Disconnected Call Event (DiCE) is when a call is disconnected.
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Direct Inward Dialling (DID) is a service provided by a local phone company (or local exchange carrier) that provides a block of telephone numbers for calling into a company’s private branch exchange (PBX) system. Using DID, companies can offer customers individual phone numbers for each person or workstation within the company without requiring a physical line into the PBX for each connection.
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Direct access contributes to the trustworthiness of your number. There are many regulations surrounding making calls and sending messages. Certain numbers are sanctioned by carriers as A2P (App to Person) numbers.   Sinch has a wide range of pre-authorized numbers for rental. So, when you see “direct access” in selecting a number from the Sinch Customer Dashboard, that means it is ready to use and will be provisioned according to a few outside factors (use cases, volume, country, etc.) upon approval for use.   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.
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A direct connection is a valid and authenticated connection to the SMSC of a mobile network operator. At Sinch, we work directly with mobile operators to negotiate commercial contracts and to connect directly to their network.
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A combination of Direct and TPOA routing.
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