A system and method for providing telephone service to a user of a telecommunications device using a data network service provider. The data network service provider has a local service host that is accessible by a local access identifier. A caller uses a telecommunications device to dial the local access...http://www.google.fr/patents/US6804224?utm_source=gb-gplus-shareBrevet US6804224 - System and method for providing telephone service having private branch exchange features in a voice-over-data network telephony system
System and method for providing telephone service having private branch ...
