Methods and apparatuses, including computer program products, are described for establishing and controlling communication sessions between SIP devices and website application servers. An access portal computing device is coupled between one or more SIP devices and one or more website application servers. The access portal is configured to authenticate SIP user credentials based upon receipt of a SIP message from a SIP device and determine website user credentials associated with a website application server based on the SIP user credentials. The access portal is configured to receive, from the website application server, a communication services application based upon transmission of the website credentials to the website application server, translate SIP requests received from the SIP device into web-based commands for transmission to the website application server, and translate web-based commands received from the website application server into SIP requests for transmission to the SIP device.