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Reply To: GSM protocols

Wallis Dudhnath

Line Reversal was used with Analogue Networks. Classic Coin and Fee Checks with Payphones.

For Signalling C7 / ss7 is ubiquitious. Some Networks (legacy
requirements) still support R2 MFC signalling.

For Landline solutions with a Local Loop (Two-Wire interface), a line reversal is used to provide “wetting current” before CLI is sent to the CPE. Line Reversal, FSK (CLI) followed by the Ringing Current (from the CLIC).

VBR/ Wallis Dudhnath