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DualPass is a signalling gateway between Diameter and SS7/MAP & CAP protocols.

For Diameter-to-SS7/MAP interworking, the main reference is 3GPP TS29.305. MAP itself is defined in TS29.002 and the starting point for the Diameter Command Code Registration for the 3GPP Evolved Packet System (EPS) is RFC5516, which in turn points to a number of 3GPP specifications.

For Diameter-to-SS7/CAP interworking I didn't find a reference. Hopefully, things are much easier there, as the base for the Diameter application is RFC4006 and the translation to CAPv2/3/4 and vice versa is very native.

The Diamap project is being written in C and C++ and is not finished yet.