IT1131125B - Dispositivo di appliazione di segnali di attesa di chiamata telefonica - Google Patents
Dispositivo di appliazione di segnali di attesa di chiamata telefonicaInfo
- Publication number
- IT1131125B IT1131125B IT21740/80A IT2174080A IT1131125B IT 1131125 B IT1131125 B IT 1131125B IT 21740/80 A IT21740/80 A IT 21740/80A IT 2174080 A IT2174080 A IT 2174080A IT 1131125 B IT1131125 B IT 1131125B
- Authority
- IT
- Italy
- Prior art keywords
- telephone call
- call waiting
- waiting signals
- signals
- telephone
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/428—Arrangements for placing incoming calls on hold
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/035,139 US4298774A (en) | 1979-05-02 | 1979-05-02 | Call waiting signal arrangement |
Publications (2)
Publication Number | Publication Date |
---|---|
IT8021740A0 IT8021740A0 (it) | 1980-05-02 |
IT1131125B true IT1131125B (it) | 1986-06-18 |
Family
ID=21880893
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT21740/80A IT1131125B (it) | 1979-05-02 | 1980-05-02 | Dispositivo di appliazione di segnali di attesa di chiamata telefonica |
Country Status (4)
Country | Link |
---|---|
US (1) | US4298774A (it) |
BE (1) | BE881361A (it) |
CA (1) | CA1149089A (it) |
IT (1) | IT1131125B (it) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61179647A (ja) * | 1984-12-29 | 1986-08-12 | Fujitsu Ltd | サ−ビス表示用ランプの点灯方法 |
US4660220A (en) * | 1986-02-25 | 1987-04-21 | Kraus Constantine R | No answer mode for telephone systems |
US5384832A (en) * | 1992-11-09 | 1995-01-24 | Commstar, Inc. | Method and apparatus for a telephone message announcing device |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3050592A (en) * | 1959-10-01 | 1962-08-21 | Automatic Elect Lab | Message waiting indicating circuits |
DE2514657A1 (de) * | 1975-04-03 | 1976-10-14 | Deutsche Telephonwerk Kabel | Schaltungsanordnung fuer einen ringleitungsspeisesatz mit bedienungsteil |
US4081613A (en) * | 1976-05-14 | 1978-03-28 | International Telephone And Telegraph Corporation | Bi-directional signalling arrangement for telecommunications systems |
JPS5328317A (en) * | 1976-08-30 | 1978-03-16 | Hitachi Ltd | Control system of subscriber's calling signal |
US4140882A (en) * | 1977-09-12 | 1979-02-20 | Wescom Switching, Inc. | Methods and apparatus for special status indication in telephone systems |
-
1979
- 1979-05-02 US US06/035,139 patent/US4298774A/en not_active Expired - Lifetime
-
1980
- 1980-01-28 BE BE2/58369A patent/BE881361A/fr not_active IP Right Cessation
- 1980-04-24 CA CA000350615A patent/CA1149089A/en not_active Expired
- 1980-05-02 IT IT21740/80A patent/IT1131125B/it active
Also Published As
Publication number | Publication date |
---|---|
BE881361A (fr) | 1980-05-16 |
US4298774A (en) | 1981-11-03 |
IT8021740A0 (it) | 1980-05-02 |
CA1149089A (en) | 1983-06-28 |
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