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In the business context, the numbers in the format of 15XX-XXXX and 16XX-XXXX are business representative agency or customer services. While the numbers starting with 080 (e.g., 080-XXX-XXXX) are also business-related numbers but are usually toll-free customer service centers. Also in this case, 15XX, 16XX or 070 are not put in the brackets ...
It is the practice of including the area code of a telephone number when dialing to initiate a telephone call. When necessary, the ten-digit number may be prefixed with the trunk code 1 , which is referred to as 1+10-digit dialing or national format .
Microsoft canonical address format for telephone numbers [2] [3] derives from E.123 international notation by allowing explicit indication of area code with parentheses. The canonical format is used by the Telephony API (TAPI) , a Windows programming interface for dial-up fax, modem, and telephone equipment.
This means that to call another number within the same city or area, callers need to dial only a subset of the full telephone number. For example, in the NANP, only the seven-digit number may need to be dialed, but for calls outside the local numbering plan area, the full number including the area code is required.
Non-geographic toll-free telephone numbers (800, 833, [4] 844, 855, 866, 877, 888) and premium-rate telephone numbers (900) are allocated centrally by the NANP Administrator. Calls to telephone numbers with the central office code 976 are billed as expensive premium calls.
The North American Numbering Plan is based on a ten-digit telephone number assigned to each telephone in the telephone network. The number is composed of the three-digit numbering plan area code, a three-digit central office code, and a four-digit station or line number. Certain rules govern the numerical format of each part.
A SIP address is written in user@domain.tld format in a similar fashion to an email address.An address like: sip:1-999-123-4567@voip-provider.example.net. instructs a SIP client to use the NAPTR and SRV schemes to look up the SIP server associated with the DNS name voip-provider.example.net and connect to that server.
Since October 6, 2019, 5:00 a.m. PHT, the following telephone number format to be followed: PXXX-YYYY where P is for Public Telecommunication Entity, and the XXX-YYYY is the telephone number. NTC has assigned the following Public Telecommunications Entity (PTE) identifiers: [2] [3] 3XXX–YYYY: Bayan Telecommunications