This application note describes how to add a SPA500S Attendant Console (Sidecar) to a Cisco SPA5xx IP phone in an Asterisk environment. Readers of this document are expected to be familiar with IP networking and the administration tasks involved with configuring VoIP in an Asterisk environment.
Here are some BLF troubleshooting hints: https://supportforums.cisco.com/docs/DOC-9969
