08.063GPPRelease 1999Signalling transport mechanism Specification for the Base Station System - Mobile Services Switching Centre (BSS - MSC) interfaceTS
The functional requirements are as follows:
a) the network call control functions are as specified in Technical Specifications 3GPP TS 08.08 and 3GPP TS 04.08;
b) the minimum set of Message Transfer Part functions are specified in Blue Book CCITT Recommendations Q.702, Q.703, Q.704 and Q.707, with the qualifications specified in this Technical Specification;
The functions are specified in ANSI T1.111  for T1 links.
c) the additional interface functions required for the proper operation of the layer 3 control functions in combination with the Message Transfer Part functions, is specified in clause 4 of this Technical Specification.