Bearer Independent Call Control (BICC) Capability Set 1+ (CS1+)
|Publication Date:||1 February 2002|
Scope, Purpose, and Application
The Bearer Independent Call Control (BICC) protocol provides the signaling functions required to support narrowband ISDN services independent of the bearer technology and signaling transport technology used.
The BICC protocol uses the Signaling Transport Converter (STC) layer for signaling message transport. The STCs are defined in T1.674-2002.
Several arrangements are possible for nodes that support BICC signaling. These nodes may have an associated Bearer Control Function (BCF), in which case they are referred to as Serving Nodes (SN). A node without an associated BCF is referred to as Call Mediation Node (CMN). Between SNs, the control of bearers is provided by other protocols not specified by this standard.
Bearer control signaling can be deployed over a separate signaling transport or the bearer control protocol can be tunneled through the "horizontal" BICC protocol between peer Call Service Functions (CSFs). The Bearer Control Tunneling Protocol is specified in T1.677-2001.
In an SN, the Call Service Function and the BCF entities may be physically separated. The Call Bearer Control (CBC) signaling is used between these two entities in case of physical separation. This standard does not assume physical separation of CSF and BCF entities; CBC signaling is outside the scope of this standard.
Both SNs and CMNs are modeled using the "Half Call" modeling technique. Every call-processing scenario is thus divided between an incoming and an outgoing signaling procedure. In the scope of this standard at least one of this procedures is the BICC procedure (see Figure 1/T1.673.1 and Figure 2/T1.673.1).
The BICC protocol is based on, and uses wherever applicable the same signaling procedures, information elements and message types as the ITU-T BICC protocol specified in:
- ITU-T Recommendation Q.1902.1 (2001), BICC protocol (CS2) functional description.1
- ITU-T Recommendation Q.1902.2 (2001), BICC protocol (CS2) general functions of messages and parameters.1
- ITU-T Recommendation Q.1902.3 (2001), BICC protocol (CS2) formats and codes. 1
- ITU-T Recommendation Q.1902.4 (2001), BICC protocol (CS2) basic call procedures. 1
- ITU-T Recommendation Q.1902.5 (2001), Exceptions to the Application Transport Mechanism in the context of Bearer Independent Call Control. 1
- ITU-T Recommendation Q.1902.6 (2001), Generic signaling procedures and support of the ISDN User Part Supplementary Services with the Bearer Independent Call Control protocol. 1
- ITU-T Recommendation Q.765.5 (2000) and Amendment 1 (2001), Application Transport Mechanism - Bearer Independent Call Control. 1
- ITU-T Recommendation Q.1912.1 (2001), Interworking between Signaling System 7 ISDN User Part and the Bearer Independent Call Control Protocol. 1
- ITU-T Recommendation Q.1912.2 (2001), Interworking between selected signaling systems (PSTN access, DSS1, C5, R1, R2, TUP) and the Bearer Independent Call Control protocol. 1
- ITU-T Recommendation Q.1912.4 (2001), Interworking between DSS 2 and the Bearer Independent Call Control Protocol. 1
The BICC protocol is flexible enough and has sufficient spare capacity to accommodate any foreseeable requirements that may be imposed by the introduction of new supplementary services and network capabilities.
The BICC protocol is specified in Chapters T1.673.1 to T1.673.7 of this American National Standard. A functional description of the BICC protocol is provided in this chapter. General functions of messages and parameters are provided in T1.673.2. BICC formats and codes are specified in T1.673.3, while basic call signaling procedures are specified in T1.673.4. Exceptions to the Application Transport Mechanism in the context of BICC are described in T1.673.5; Chapter T1.673.6 specifies the APM-user to support the transport of the bearer related information for the BICC. Performance objectives in the BICC application are provided in T1.673.7.
In addition to the basic service, this issue of the BICC protocol standard also supports a number of supplementary services and network capabilities. The BICC protocol and procedures required to support these services and network capabilities are similar to the corresponding ISDN User Part procedures defined in other American National Standards.
1 This document is available from the International Telecommunications Union.