 |
| |||
| ring duration (A call-forwarding option that allows the user to set the number of seconds that the phone will ring before a call is redirected) | |||
| signal running time | |||
| продолжительность сигнала: 18 phrases in 10 subjects |
| Astronautics | 1 |
| Automated equipment | 4 |
| Aviation | 1 |
| Mass media | 3 |
| Military | 1 |
| Rail transport | 2 |
| Road works | 1 |
| Security systems | 3 |
| Technology | 1 |
| Telecommunications | 1 |