Improved methods for providing a voice communications path over the internet. According to a first embodiment, a first PBX coupled to a first internet gateway device determines whether or not a second PBX has access to a second internet gateway device and, if so, the second PBX sends the IP (internet...http://www.google.fr/patents/US6584094?utm_source=gb-gplus-shareBrevet US6584094 - Techniques for providing telephonic communications over the internet
Techniques for providing telephonic communications over the internet
