6 V‑ and S‑series interface procedures to 04.08 mapping

07.033GPPTerminal Adaptation Functions (TAF) for services using synchronous bearer capabilitiesTS

Interface procedures not directly mappable to GSM 04.08 [5] (ie. V.25 bis VAL/INV) are not considered. Mobile management procedures of GSM 04.08 are not considered applicable.

Mapping of other call establishment or clearing messages to the S interface e.g. "Call proceeding", etc. have not been included. It is assumed these will be able to be mapped directly and are of no relevance to the V.25 bis or manual interface.

For Alternate speech/data and Speech followed by data digital services it will be necessary for the TAF to generate a "Modify" message for transmission, this shall be generated manually derived from MMI. This shall be according to the defined procedure in GSM 04.08 [5].

6.1 Mobile Originated calls

a) SETUP

Element

Derived from

MMI

V.25 bis message

S interface message

Called Address

Keypad

CRN/CRI/CRS

Setup

Called

Sub Address

Keypad

CRI

Setup

HLC

Derived from internal settings or MMI information.

Setup

LLC

Same as HLC

Setup

BC

Same as HSC

GSM 07.01 gives allowed values

Setup (with additional information from MMI oriented settings)

b) RELEASE COMPLETE

Element

Derived from

MMI

V.25 bis message

S interface message

Cause

Display (optional)

CFI

Release complete

6.2 Mobile Terminated calls

Call establishment is initiated by receipt of Setup at the MS:

a) SETUP

Element

Mapped on to

MMI

V.25 bis message

S interface message

Called Address

Display (optional)

INC

Setup

Called

Sub Address

Display (optional)

Not applicable

Setup

HLC

Display (optional)

Not applicable

Setup

LLC

Display (optional)

Not applicable

Setup

BC

Display (optional)

Not applicable

Setup (with PLMN specific elements removed)

b) CALL CONFIRM

Information for the BC element in the call confirm is derived from e.g. MMI or by internal settings.

c) CONNECT

Connect is sent in response to connect from the S‑interface, CIC from V.25 bis or from MMI.