 |
| |||
| MF signaling; dual-tone multifrequency signaling; MF signalling; multifrequency signaling; multifrequency signalling | |||
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