Draft Details

The present document defines the Terrestrial Trunked Radio (TETRA) system supporting Voice plus Data (V+D). It 
specifies: 
• the interworking of individual calls between TETRA networks; 
• the supplementary services interaction with individual calls between TETRA networks. 
The TETRA V+D interworking - basic operation part defines the interworking between TETRA networks over the 
corresponding interface: the Inter-System Interface (ISI). It comprises the following sub-parts: 
• Transport layer independent General design [2]; 
• General Design, PSS1 over E.1 [i.10]; 
• General Design, SIP/IP [i.11]; 
• Transport layer independent Additional Network Feature - ISI Individual Call (ANF-ISIIC) (the present 
document); 
• Transport layer independent Additional Network Feature - ISI Group Call (ANF-ISIGC) [5]; 
• Transport layer independent Additional Network Feature - ISI Short Data service (ANF-ISISDS) [i.8]; 
• Transport layer independent Additional Network Feature - ISI Mobility Management (ANF-ISIMM) [6]; 
• Generic Speech Format Implementation [i.7]. 
The present document is the ANF-ISIIC sub-part. 
Like all other Additional Network Feature (ANF) specifications, those of ANF-ISIIC are produced in three stages, 
according to the method described in Recommendation ITU-T I.130 [i.4]. The present document contains the stage 1 
and 2 descriptions of ANF-ISIIC, and stage 3 description. The stage 1 description specifies the ANF as seen by its 
users, which are essentially the individual call control entities in both TETRA networks. The stage 2 description 
identifies the functional entities involved in the ANF and the information flows between them. And the stage 3 
description of ANF-ISIIC specifies its protocol. 
NOTE 1: According to Recommendation ITU-T I.130 [i.4], the stage 3 description of a bearer or tele-service 
addresses the network implementation aspects. Consequently, it comprises two steps: the specifications of 
all protocols at the various reference points involved in any of the service procedures (notably the service 
operation) are the first step of the stage 3 description, and the specifications of the functions of the 
corresponding network entities are its second step. 
NOTE 2: The SDL diagrams have not been provided since they can be derived from the specification of the 
functional entity actions in the stage 2 description. 
The present document applies to TETRA networks which support inter-TETRA individual calls. More specifically, it 
applies to their Circuit Mode Control Entities (CMCE), as defined in clause 14.2 of ETSI EN 300 392-2 [1], and to their 
ANF-ISIIC entities defined in the stage 2 description. 
The relation between the ANF-ISIIC and the transport layer protocol is described in the General Design documents [2], 

i.10] and [i.11].