The document discusses five steps for successfully deploying SIP trunking:
1. Convert existing infrastructure to SIP trunks and choose the right deployment architecture.
2. Deploy an enterprise-class session border controller for security, interoperability, and high availability.
3. Implement a dial plan that makes sense for the business using number normalization and centralized management.
4. Move UC and other services like call centers and cloud services to SIP trunks.
5. Measure return on investment by comparing costs before and after deployment.