US5255315A
(en )
1993-10-19
Method of rerouting telecommunications traffic
JPH07203081A
(ja )
1995-08-04
情報サービスシステムと情報サービスの提供方法
JPH07154511A
(ja )
1995-06-16
情報サービスシステムとその使用方法
US6628769B1
(en )
2003-09-30
Intelligent network
CZ104497A3
(en )
1997-10-15
Switched network and a telecommunication system containing such switched network
US4782508A
(en )
1988-11-01
Method of discouraging the completion of wrong-number calls
CA2146186A1
(en )
1996-10-04
Enhanced efficient telephone number portability
US6289088B1
(en )
2001-09-11
Pay phone call completion method and apparatus
BE374732A
(sr )
CH395200A
(fr )
1965-07-15
Installation de sélection d'un central de télécommunication automatique
WO2002003171A2
(en )
2002-01-10
Method and system for providing caller identification for an unidentified calling party
US5652753A
(en )
1997-07-29
Digital telephone
GB208509A
(en )
1924-10-30
Improvements in or relating to telephone systems
US6256380B1
(en )
2001-07-03
Methods for processing operator service system calls
CA2200631C
(en )
2003-08-05
Security station receiver
US2087398A
(en )
1937-07-20
Automatic switch for use in telephone or like systems
BE373049A
(sr )
EP1493166B1
(en )
2008-05-21
Relay and cross-connect
BE374766A
(sr )
BE501256A
(sr )
CH293577A
(fr )
1953-09-30
Installation de télécommunication.
JPH01128658A
(ja )
1989-05-22
交換機の回線選択方式
JP3375384B2
(ja )
2003-02-10
着信制御方法
KR100247677B1
(ko )
2000-03-15
2-라인 및 키시스템 동작모드간을 선택하기 위한 전화 장치의 스위칭 회로
JPS6367096A
(ja )
1988-03-25
構内電話交換機