If the MS is using extended idle mode DRX and the MS is expected to respond to paging before the time indicated by the SMS-GMSC, the MSC in Deployment Option 2 (see clause 8.2.4a.1 of TS 23.272) or SGSN (or the MME for the SMS in MME feature) may buffer and send the Short Message to the MS until that time.
If the MS is using extended idle mode DRX and the MS is expected to respond to paging before the time indicated by the SMS-GMSC, the MSC in Deployment Option 2 (see clause 8.2.4a.1 of TS 23.272) or SGSN(or the MME for the SMS in MME feature) may buffer and send the Short Message to the MS until that time.