• Control plane:
MTP2 (ITU-T Q.703)
MTP3 (ITU-T Q.704)
SCCP (ITU-T Q.711-Q.716)
BSSAP (3GPP 08.08)

• User plane:
PCM Coded  G.711 A-Law and μ-Law

• Control plane:
MSUA (IETF RFC 4666, ETSI TS 102 142)
SCTP (IETF RFC 2960 & 3309, ETSI TS 102 144)

• User plane:
Iu-UP (3GPP TS 25.415)
RTP (ETF RFC 1889 (RTCP partly supported), ETSI TS 125 414)
IPv4 (RFC 2225, RFC 791)
UDP (RFC 768, RFC 791)