Can I connect to the SMSC of a mobile network operator through SS7?
No SS7 is the signaling protocol inside a mobile network. It is used in the SMS delivery between the SMSC, the HLR, and the mobile terminal. It is usually used over E1 ISDN lines, but it can also go through IP. The IP version of SS7 is called SIGTRAN. Ozeki NG SMS Gateway does not implement the SS7 signaling protocol. To connect to the SMSC, you need to use an IP SMS protocol.