Dial unit detachably mounted on public telephone for equal acces

Details Dial unit detachably mounted on public telephone for equal acces Dial unit detachably mounted on public telephone for equal acces

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.
patent: 4769834 (1988-09-01), Billinger et al.
patent: 4782519 (1988-11-01), Patel et al.
patent: 4791665 (1988-12-01), Bogart et al.
patent: 4924497 (1990-05-01), Smith et al.
patent: 4926469 (1990-05-01), Smith et al.

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