9.6 Functional behaviour of VLRB

23.0793GPPRelease 17Support of Optimal Routeing (SOR)Technical realizationTS

9.6.1 Functional behaviour of VLRB for provision of subscriber information

The functional behaviour of VLRB for provision of subscriber information is specified in 3GPP TS 23.018 [6].

9.6.2 Functional behaviour of VLRB for roaming number allocation

The functional behaviour of VLRB for roaming number allocation is specified in 3GPP TS 23.018 [6]. The only function specific to Support of Optimal Routeing is the storage of the OR indicator, the ‘OR not supported in GMSC’ indicator, the GMSC address and the call reference number if VLRB receives them in the Provide Roaming Number request.

9.6.3 Functional behaviour of VLRB when handling an incoming call

The functional behaviour of VLRB when handling a request for information to handle an incoming call is specified in 3GPP TS 23.018 [6]. The only functions specific to Support of Optimal Routeing are:

– the inclusion in the Complete Call or Process Call Waiting, if the call is to be offered to the B subscriber, of the OR indicator and the GMSC address if VLRB received them in the Provide Roaming Number request;

– the inclusion in the Send Info For Incoming Call response, if the call is to be forwarded, of:

– the OR indicator, the ‘OR not supported in GMSC’ indicator, the GMSC address and the call reference number if VLRB received them in the Provide Roaming Number request;

– the basic service which applies for this call.