| |||
| common channel signaling 7; common channel signalling 7 | |||
| |||
| Signalling System No 7 | |||
| |||
| signalling system No.7 (ITU-T (CCITT) Rec. Q.701-764, FTZ RL 1R7) | |||
| |||
| common channel signaling 7; common channel signalling 7 | |||
| |||
| Signalling System No 7 | |||
| |||
| signalling system No.7 (ITU-T (CCITT) Rec. Q.701-764, FTZ RL 1R7) | |||
