OENORM EN 300008-1 V 1.3.2
Integrated Services Digital Network (ISDN) - Signalling System No.7 - Message Transfer Part (MTP) to support international interconnection - Part 1: Protocol specification [ITU-T Recommendations Q.701, Q.702, Q.703, Q.704, Q.705, Q.706, Q.707 and Q.708, modified]