Telephonic communications – With usage measurement – Call charge metering or monitoring
Patent
1990-04-16
1992-02-04
Dwyer, James L.
Telephonic communications
With usage measurement
Call charge metering or monitoring
379131, 379221, 379201, H04M 342
Patent
active
050864564
ABSTRACT:
A dial unit is detachably mounted on a public telephone for equal access and includes a keypad section, a registration table section, a determination processing section, and a transmitting section. The keypad section key-inputs a dial signal. In the registration table section, area codes corresponding to specific destinations to be handled as a long-distance call and a carrier code corresponding to a specific carrier line having a right of a carrier to the specific destinations are registered in advance. The determination processing section includes a dial signal determination section for determining whether or not the first digit of a dial signal to be handled for a long-distance call coincides with either a "1" or a "0", a dial signal storage section, an equal access determining section, and a carrier code adding section. The transmitting section converts the dial signal, which is temporarily stored in the dial signal storage section when a non-coincidence is determined by the equal access determining section, or the dial signal, to which the carrier code is added by the carrier code adding section when a coincidence is determined, into corresponding DTMF signals and sequentially transmits the DTMF signals after key input by the keypad section is completed.
REFERENCES:
patent: 4565903 (1986-01-01), Riley
patent: 4577066 (1986-03-01), Bimonte et al.
patent: 4685127 (1987-08-01), Miller et al.
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patent: 4791665 (1988-12-01), Bogart et al.
patent: 4924497 (1990-05-01), Smith et al.
patent: 4926469 (1990-05-01), Smith et al.
Ogihara Hiroshi
Shizawa Masahiro
Taka Katsuhiro
Anritsu Corporation
Dwyer James L.
Shehata M.
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