defined from Rel-8
3GPP2 1xCS IWS uses the S102 reference point to communicate with the MME and to transport 3GPP2 1xCS
signalling messages to the SRVCC UE. The role of the 3GPP2 1xCS IWS is:
To be a signalling tunnelling end point towards the MME for receiving/sending encapsulated 3GPP2 1xCS
signalling messages to/from the UE; and
To emulate a 1xRTT BSS towards the 1xRTT MSC (reference point A1 as defined in 3GPP2 A.S0014
between 1xBS and MSC).