About this document
DTMF Signalling in GSM Systems by Faheem Akhtar is a document available to read on EtoBox.
The document is a 3GPP technical specification that defines how dual-tone multi-frequency (DTMF) signaling is supported in the GSM system. It requires the mobile switching center to support DTMF in the mobile-to-land direction. Across the air interface, a message-based system is used where key presses are converted into start/stop DTMF messages containing the digit value. The messages use frame stealing mode and acknowledgments are sent in response.
- Author
- Faheem Akhtar
- Language
- EN