The advantages of CCS over in-channel signalling are listed below:
a. Information can be exchange between the processors much more rapidly
than when channel associated signaling is used.
b. As a result, a much wider repertoire of signals can be used and this
enables more services to be provided to customers.
c. Signals can be added or changed by software modification to provide new
services.
d. There is no longer any need for line signaling equipments on every
junction which results in a considerable cost saving.
e. Since there is no line signaling, the junctions can be used for calls from B
to A in addition to calls from A to B. Both ways working requires fewer
circuit to carry the traffic than if separate groups of junctions are provided
from A to B and from B to A.
f. Signals relating to a call can be sent while the call is in progress. This
enables customers to alter connections after they have been set up.
g. Signals can be exchanged between processors for functions other than call
processing, for example for maintenance or network management
purposes.