The SUP 2.2.SP3 Doc states, you may need to add a BES to the picture.

BES Components Required By Unwired Platform

BlackBerry Enterprise Server (BES) is the middleware software package that is part of the BlackBerry wireless platform from Research In Motion®. BES software and services connect to Unwired Platform on the corporate LAN and redirect data sent by Unwired Server.

BES uses Windows services to carry out the basic operations of the system. While many services exist, these are the ones you can use with Unwired Platform:

• BlackBerry Messaging Agent – Performs wireless calendar synchronization, generate initial encryption keys, or provide email and lookup services.
• BlackBerry MDS Connection Service– Pushes requests from intranet applications. The BlackBerry MDS Services (for Apache Tomcat) sends and receives Web browsing to the device through a BlackBerry Dispatcher service. You can use these services for Unwired Platform data flow with third-party Java applications on-device.
• BlackBerry Policy Service– Pushes wireless IT policies to devices, sets commands for device locks and remote wipe, and generates new encryption keys.
• BlackBerry Router – Routes all Unwired Platform data to wireless devices by establishing a link between BES (which can be installed on the same host as the router) and SRP host.
• BlackBerry Synchronization Service– Performs OTA backup and synchronization of all PIM data (contacts, tasks and notes), except calendar, which is instead performed by BlackBerry Messaging Agent.