A technique for providing context information for a PSTN phone call originating from an user includes dynamically selecting a phone number (or invite code or combination thereof) from among a pool of available phone numbers; displaying the selected phone number to the user in a web page; receiving context information corresponding to the user; receiving an incoming phone call on the dynamically selected phone number, connecting the incoming call to an outgoing call to the call center, and providing the context information to a computer corresponding to an agent to whom the outgoing call is connected. The context information may include a web page viewed by the user, and may be sufficient to provide a co-browsing capability. The technique may be utilized with or without session based web pages and may be performed by a sever that serves web page content to the user or a third party service provider.