FIELD: communication.
SUBSTANCE: invention relates to communication. Disclosed is a communication apparatus to which a telephone line can be connected, apparatus comprising: a first determination unit configured to determine, based on a change amount of a line direct-current voltage from telephone line per time period, whether line direct-current voltage is stable; a second determination unit configured to determine whether line direct-current voltage from telephone line is a first threshold or lower; and a third determination unit configured to, if first determination unit determines that line direct-current voltage is stable and if second determination unit determines that line direct-current voltage is first threshold or lower, determine that external telephone has captured telephone line.
EFFECT: technical result is reduction of false detection, which can be carried out, when a change of direct-current voltage line due to reasons, different from busy/occupation of external telephone line.
10 cl, 8 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| COMMUNICATION DEVICE | 2008 |
|
RU2427101C2 |
| DEVICE AND METHOD FOR WIRELESS COMMUNICATION SYSTEM AND SPECTRUM CONTROL DEVICE | 2017 |
|
RU2690014C1 |
| METHOD, DEVICE AND SYSTEM FOR THE FACSIMILE COMMUNICATION CHANNEL SWITCHING TO THE TELEPHONE COMMUNICATION CHANNEL | 2014 |
|
RU2668991C2 |
| WIRELESS COMMUNICATION DEVICE WITH SUPPORT FOR MULTIPLE ACTIVE NETWORKS | 2019 |
|
RU2754353C1 |
| DEVICE FOR COMMUTATION OF COMPUTERS TO PHONE COMMUNICATION LINES | 1992 |
|
RU2006927C1 |
| COMMUNICATION METHOD AND COMMUNICATION DEVICE | 2009 |
|
RU2509427C2 |
| DEVICE FOR SUPERVISORY DUPLEX COMMUNICATION | 0 |
|
SU1293853A1 |
| METHOD OF DETECTING FRAUD DURING ROAMING CONNECTIONS IN MOBILE COMMUNICATION NETWORKS | 2007 |
|
RU2429589C2 |
| TELEPHONE COMMUNICATION SYSTEM | 1989 |
|
RU2038699C1 |
| COMMUNICATION INTERFACE OF TELEPHONE LINE | 2006 |
|
RU2413379C2 |
