In accordance with embodiments, there are provided mechanisms and methods for integrating a private branch exchange (PBX)-equipped client and an on-demand database service. These mechanisms and methods for integrating a PBX-equipped client and an on-demand database service can enable embodiments with additional infrastructure at the client that is better equipped to leverage the on-demand database service. The ability of embodiments to provide such client side infrastructure can enable additional enhanced services in conjunction with telephone calls, etc.