 |
| |||
| signaling system 7 (для разгрузки аналоговых телефонных сетей за счёт использования цифровых линий связи) | |||
| система сигнализации номер 7: 1 phrase in 1 subject |
| Mass media | 1 |
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Add | The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Report an error
| Get short URL | Language Selection Tips