 |
| |||
| ATB signal; all trunks busy signal; channel-busy tone; congestion tone; reorder signal | |||
| no circuit signal | |||
| tonalité d'encombrement: 2 phrases in 1 subject |
| Telecommunications | 2 |
|
| |||
| ATB signal; all trunks busy signal; channel-busy tone; congestion tone; reorder signal | |||
| no circuit signal | |||
| tonalité d'encombrement: 2 phrases in 1 subject |
| Telecommunications | 2 |