Virtual Private Networks

The following guidelines should be followed for the deployment for WAN VPN networks:

• Service Level Agreements (SLAs) with packet network operators (carriers) should include agreements about packet impairment levels, reserved bandwidth, availability (possibly to be supported by sufficient redundancy), performance monitoring feedback, and security guarantees.
• The exact SLA parameter values for packet impairments and availability should be in compliance with the overall end-to-end budget for impairment.
• Reserved bandwidth should take into account the small network growth scenarios.
• Voice security guarantees should take into account the company corporate information officer (CIO) security policies.