Tdoc TSGS3(99)207
Tdoc SMG10 AP99-076

Source:	SMG10 & TSG-SA WG3 
To:	TSG CN WG2
cc:			TSG CN, TSG SA
Title:	Liaison statement answer on IST for non-CAMEL subscribers

SMG10 & TSG SA WG3 thanks TSG CN WG2 for their liaison concerning 'IST for non-CAMEL subscribers' (TSG3(99)134/SMG10AP99-068/3GPP NP-99180/3GPP N2-99675) and are glad that TSG CN WG3 has been continuing the development of the stage 2 specification for Immediate Service Termination for non-CAMEL subscribers.

In response to the specific issues SMG10/TSG SA WG3 makes the following statements:

1. 	SMG10 & TSG SA WG3 still require the development of the non-CAMEL based IST stage 2 specification.

2.	Regarding the necessity of a standalone IST command vs. the triggering of the IST command via the MSC by alerting the HLR TSG CN WG2 are left to decide on this. However, SMG10 & TSG SA WG3 understand the implications of the two choices.

3.	As stated in a previous LS answer to SMG3-WPC on non-CAMEL-IST (SMG10 98P312) it is agreed that the termination of GPRS PDP context should also be considered. Though such a requirement is not presently within the IST stage 1, GSM 02.32, with the predicted increase in data traffic, IST for GPRS is considered very important, and CN2 should consider it an SA3 requirement.  CN2 are thanked for pointing out the omission of GPRS from 02.32. Once a solution has been found, SMG10& TSG SA WG3 will introduce a change request to GSM 02.32 to include such a requirement.