Designing Global Voice Infrastructure

Start with the traffic map

Before choosing components, describe where calls originate, where they terminate and which of those paths carry revenue. Infrastructure decisions become straightforward once the highest-value paths are explicit.

Redundancy is a routing property

Redundancy is not only about duplicated servers. It is about having more than one viable path to each destination and a policy that decides when to use the alternative. Failover that has never been exercised should be treated as untested.

• At least two routes per significant destination
• Health signals that can trigger a route change
• Deliberate, reviewed traffic management policy
• Monitoring that measures completion, not just reachability

Observability for voice

Voice quality problems are rarely binary. Track answer-seizure and completion patterns per route and per destination over time; a slow degradation on one path is far more common than a total outage, and far easier to miss.