Английская Википедия:ITAD Subscriber Numbers

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Шаблон:Technical Шаблон:Notability ITAD Subscriber Numbers, or ISNs, provide a way of interconnecting VOIP PBXs by adding a number to the internal phone number of the target phone. The ITAD[1][2] number is added to the target phone number preceded by an asterisk.[3] Therefore, only numbers and symbols which appear on a telephone keypad are used.[4]

References

Шаблон:Reflist


Шаблон:Telecomm-stub