Application
server is node where business logic of services such as VPBX, VPN, Call
Forwarding, Unified Communication etc. is implemented. Application server
provides services for end subscribers as well as corporate users. Application
logic in Application server can be invoked via SIP, IT APIs (e.g. REST) and
legacy telco protocols. Application server can be operated in cloud or in on
premise mode.
Telecommunication
Application Server
The
Telecommunication Application Server supplies services developed for circuit
switch network on IMS network. By this approach it stays possible to offer
legacy services (Call Forwarding, Barring, CW, etc.) for 1. LTE users, 2.PSTN
users after legacy PSTN switch off. Telecommunication Application Server can be
extended by convergent services such as Unified Communication, integration with
Webex etc.
Standalone
Application Server
Provide
similar services as Telecommunication Application Server, but it can be
operated without IMS since it contains Registrar, Media Server, Router/Load Balancer.
VoLTE
Single Voice Call continuity application
This application
is must when operator starts LTE. It enables to LTE users to be reachable
(continue already setup calls) even if move outside LTE coverage. The Single
Radio Voice Call Continuity (SRVCC) provides an interim solution for handing
over VoLTE (Voice over LTE) to 2G/3G networks.
Carrier
Routing
Enable advance
routing for interconnect international traffic. It allows dynamically configure
routing rules based on variety of criteria. This application supersedes routing
features on legacy switches that does not allow such wide and “easy to change”
configuration and thus these legacy switches do not fit today business needs.
Carrier routing application brings potential of additional revenue for
interconnect business.
Number
Translation Services
Application
allows smooth realization of Free phone, UAN, PRM. Application enables
different levels of configuration e.g. most advanced used by telco operator
that run this service, the second one by telco operator that sell this services
to end customer and the third one for end customers.
Virtual
Private Network
The VPN
application adds support of Virtual Private Network functionality into IMS. The
main functionality is based on merging subscribers into groups (Friends and
Family) with own numbering plan, definition of screening rules between them or
out of group calling.
Machine
2 Machine applications
For M2M
communication will be needed new applications for example similar to VPN
service. The subscriber wants to group all his machines in households. It defines
rules for communications, B/W list, Firewalls etc.
Instant
messaging applications
The application
is based on statuses of subscriber in Instant messaging client statuses, where
application could do redirection/forwarding of calls according to them.
Service
delivery platforms
Application
stores to supply chargeable functionalities. SDPs are applicable to both
consumer and business applications.