Consider the scheme of the call “8-800” from the point of view of charging

Briefly and simply about the complex – charging in “8-800” – Part 2

The very possibility of charging a call to the number 8-800 in the SS7 protocol (OCS7) is realized using the so-called Reverse Charging function. Initially, this function was created for the popular Collect Call service (call at the expense of the called subscriber). In detail from the point of view of the SS7 protocol, the REVC function (such a reduction is often used for Reverse Charging) is described in ITU-T Recommendation Q.736.3.