Telecommunication network which transmits the state of an occurrence of a non-call related service request associated with a network termination

A telecommunications network comprising:

• a plurality of physically interconnected nodes which can be functionally interconnected to support call traffic links;
• a Basic Call State Model, (BCSM) in which the current state of a call in progress between two user terminals is stored and used to control call-related services;
• additional means for assessing the occurrence of a non-call related service request associated with one of the nodes including a functional element triggerable between two states:
• a first state where no service request is in process and second state where a service request is in process, the means for assessing being triggerable independently of the existence of a call traffic link so that the condition of the functional element controls the mode of operation of the network;
• and
• means for transmitting the state of the assessing means associated with a network termination to the service control means, wherein:
• the plurality of nodes includes a plurality of network terminations, there being provided switching means to provide functional interconnections between said terminations, and
• the triggering of a means for assessing causes a service request to be transmitted from a node to a service control means.