How does a TSC manage VoIP traffic across network borders?

A TSC plays a crucial role in managing VoIP traffic across network borders by working with session border controllers (SBCs). SBCs are specialized devices that provide security, media handling, and interoperability between different VoIP networks. They help to ensure that calls can be reliably set up and maintained while addressing issues such as codec translation, encryption, and NAT traversal.

Through the cooperation of TSC and SBCs, VoIP traffic can be monitored and controlled more effectively, allowing for better quality of service (QoS), increased security against potential threats, and the ability to manage different protocols and signaling methods used by various networks. This collaboration is essential for seamless communication, especially when handling calls that traverse diverse network environments with differing policies and technologies.

The other options present methods that do not adequately address the complexities of managing VoIP traffic across network borders. For instance, directly routing calls through the internet may lead to unregulated traffic flow that can compromise quality and security. Establishing dedicated physical lines is often impractical and cost-prohibitive for widespread VoIP management. Lastly, peer-to-peer connections do not facilitate effective management of traffic in a networked environment where varying security and quality requirements must be met.