29.280: Evolved Packet System (EPS); 3GPP Sv interface (MME to MSC, and SGSN to MSC) for SRVCC

Info Page @ 3GPP
Rel-13
v13.0.0
Rel-12
v12.3.0
v12.2.0
Rel-11
v11.6.0
Rel-10
v10.5.0
Rel-9
v9.9.0
Rel-8
v8.8.0