V150.1 MER Modem Relay Support for TDM to SIP Gateway
The Cisco V.150.1 Minimum Essential Requirements feature complies with the requirements of the National Security Agency (NSA) SCIP-216 Minimum Essential Requirements (MER) for V.150.1 recommendation. This feature is added to support V.150.1 MER modem relay support on SIP gateways. This is of importance to establish secure calls as per V.150.1 MER specifications between two SIP gateways with the PSTN line side being T1/E1 CAS or PRI. Typically, specialized encryption-capable BRI/analog phones (STE) that can communicate over V.150.1 modem relay or over modem pass-through are used as endpoints.