XO has hired Ronan Keenan to handle their corporate social media, like the @XOComm twitter account. They put together quite the resource for SIP Trunking Deployment at Storify: SIP trunking implementation resources including videos, presentations and documents by Steve Carter, who is the SIP Product Manager at XO.
He narrates a detailed video about SIP Trunking: Learn the Steps to a Smooth Enterprise SIP Trunk Implementation. Good info for Agents to use to learn on their own at their own pace.