Public land mobile network : interworking with ISDN PSTN: recommendations Q.1000 - Q.1032 / International Telecommunication Union
Public land mobile network : mobile application part and interfaces: recommendations Q.1051 - Q.1063 / International Telecommunication Union
Specifications of signalling systems Nos. 4 and 5 : recommendations Q.120 - Q.180 / International Telecommunication Union
Specifications of signalling systems No. 6 : recommendations Q.251 - Q.300 / International Telecommunication Union