Patent ID: 9270707
Filing Date: 2016-02-23
CPC Classification: H04L

Claim Text:
1. A method of enforcing use of an enterprise voice application server as a SIP proxy server for enterprise VoIP communications, wherein the enterprise includes a client device having a first IP address and a client uniform resource identifier (URI), and a Private Branch eXchange (PBX) configured as a SIP registrar having a registration entry binding the client URI to the first IP address, the enterprise voice application server having a proxy URI and a second IP address, the method being performed by the client device and comprising: receiving, at the client device, a SIP request message directly from the PBX addressed to the client URI for a call made to the client device; and determining, from the client device, that the SIP request message was not sent via the enterprise voice application server and, upon said determining, then: