Residential Subscriber
VoIP can be a good solution for an alternative voice service provider. In this case the subscribers connect to a softswitch that replaces the Local Exchanges in the classical PSTN networks. The advantages you have as a Carrier are the advantages that come with Voice over Internet Protocol.
Some of them are that the price per user is much lower than in the case of classical telephony, the CAPEX and OPEX are significantly lower and the fact that a carrier can offer a larger number of services to its subscribers than in the case of PSTN.
The softswitch is "the brain" of the network registering the VoIP subscribers and controlling the Signaling and Media Gateways. It knows, in each moment, the actual state of every device in the network. All the signalings of calls originated from the subscribers of the VoIP carrier or terminated in the VoIP carrier network are passed to the softswitch.
The alternative VoIP carrier can offer value added services to its subscribers - for instance VoiceMail, Unified Messaging or video calls by usage of IP video telephones. Using the billing engine of the softswitch the carrier sends the billing information to its subscribers exactly as classical PSTN carriers.
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