Transparency: The SGW must be transparent to both the SS7 network and the VoIP. It needs to appear as a signaling end point or a pass-through device for SS7 messages, supporting the correct protocols and application programming interfaces.
Translation: The address translation between the SS7’s addressing scheme (point codes) and the VoIP network (IP addresses) is carried out by the SGWs. Also, if the SGW functions as an STP for the SS7 network, it is essential to carry out global title translation functions, for example, telephone number to point codes.
Trusted routing: The trademark of the SS7 network is the dependability of its message delivery. The SGW ensures that the reliability is carried throughout the IP network. The stability is guaranteed by the multi-homing functionality of the SCTP.
