The Type of Number (TON) setting is used to tell your External Short Messaging Entity (ESME) the format of the addressing (bind addressing) that will be processed for inbound messages as well as inform the Mitto network (for both source and destination addressing) how it should be processed for submits. The Numbering Plan Indicator (NPI) is a number which is defined in the ITU standard Q.713, paragraph 220.127.116.11.3, indicating the numbering plan of the attached telephone number.
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