The present document provides the ETSI endorsement of the ITU-T BICC Capability Set 1 protocol Recommendations
Q.1901 [1] and Q.765.5 [2]
ITU-T Recommendation Q.1901 [1] describes the adaptation of the narrowband ISDN User Part (ISUP) for the support
of narrowband ISDN services independent of the bearer technology and signalling message transport technology used,
for the pan-European Integrated Services Digital Network (ISDN) as provided by the European public
telecommunications operators.
ITU-T Recommendation Q.1901 [1] is written as a set of exceptions to the ISUP Recommendations.
The protocol defined by ITU-T Recommendation Q.1901 [1] is the call control protocol to be used between "Serving
Nodes". This protocol is called the "Bearer Independent Call Control" protocol, (BICC). Between Serving Nodes the
control of bearers is provided by other protocols - not specified by this Recommendation.
Three types of Serving Node (SN) are defined:
Interface Serving Node (ISN) - this type of node provides an interface to circuit switched networks;
Transit Serving Node (TSN) - this type of node provides transit functionality, for call and bearer, within one
network using the BICC protocol;
Gateway Serving Node (GSN) - this type of node provides inter-network gateway functionality, for call and
bearer, using the BICC protocol.
ITU-T Recommendation Q.1901 [1] also contains an appendix that is relevant to a Call Mediation Node, where call
control functions may reside, without any bearer control capability.
ITU-T Recommendation Q.765.5 [2] describes the extensions required for the transport of bearer related information
associated with the BICC protocol. The BICC is used to manage the call control instance that has been separated from
the bearer control instance. The BICC needs to transport bearer related information between call control instances. The
Application Transport Mechanism is used for this purpose (...abbreviated)