The CCITT, considering that new networks are being introduced based upon stored program control techniques; that these networks as well as being able to carry the international telex service, can also carry the Intex service using alphabets other than International Telegraph Alphabet No. 2 and that interworking between these services is essential: that the Intex service requires the establishment of new types of signalling, and that these signalling types shall permit interworking between Intex terminals, between telex terminals and Intex terminals, and between telex terminals and terminals capable of operating both telex and Intex dual service terminais.