Telephony orchestration turns your phone system into a programmable service. Every call becomes an event your applications can observe, route and enrich. Instead of static rules buried in a PBX, you control calls through APIs and webhooks, with smart routing that takes into account your business data, team availability and the caller’s context.
Voxivra has been building this kind of layer for more than 20 years, on open architectures based on Asterisk and SIP. We step in when telephony needs to talk to the rest of your stack instead of running in isolation.
What telephony orchestration covers
An orchestration platform sits between the telephone network (SIP carrier, PBX, contact center) and your applications. It typically does four jobs:
- Programmable call control: answer, transfer, hold, conference, record or hang up a call from an application service.
- Real-time events: send webhooks at each step (incoming call, answer, transfer, hangup) to your CRM, monitoring tools or data warehouse.
- Data-driven routing: pick the destination based on the identified customer, language, history, business hours, service level or queue load.
- Composable building blocks: chain an IVR, a voicebot, a live agent and an automated callback in one journey without rewriting the logic each time.
Real-world use cases
- Context-based routing: a customer with an open ticket goes straight to the agent handling it; an unknown caller goes through voice triage.
- Smart overflow: past a given wait time, the caller is offered a callback, sent to another site or handled by a voicebot.
- Application-triggered calls: a business event (stuck order, appointment to confirm) triggers an outbound call or voice notification.
- Multi-site, multi-carrier: a single routing logic across several sites, PBXs or carriers, with centrally managed rules.
- Phased AI adoption: insert a voicebot on one call flow, measure, then expand, without touching the rest of the infrastructure.
In contact centers, orchestration is usually what makes it possible to combine automation and live agents without hurting the customer experience.
How we build it
The core: Asterisk, ARI and AGI
Asterisk remains a solid foundation for orchestration, provided you pick the right interface. With Asterisk ARI, your application keeps full control of the call (channels, bridges, media) over REST and WebSocket. That is our default approach for dynamic journeys and AI integrations. AGI is still a good fit for simple logic inserted into an existing dialplan. We explain the trade-offs in Asterisk AGI vs ARI.
SIP layer and load distribution
Depending on volume, we add a SIP proxy (Kamailio or OpenSIPS) for load balancing, trunk management and isolation of media nodes. TLS/SRTP encryption and SIP filtering are part of the design from day one.
APIs and webhooks
We expose an internal API (REST, sometimes gRPC) to control calls, and an event stream through signed webhooks or a message queue. Contracts are documented and versioned so your developers can build on them with confidence.
Resilience
Every outbound API call has a maximum timeout and a defined fallback. If a third-party service does not respond, the call follows a default path instead of hanging. For critical environments, we design a redundant multi-node architecture.
Observability
An orchestration layer is only useful if you can see what it does. Every call carries a correlation ID that follows it across the PBX, the orchestration services and your applications. We expose metrics such as concurrent calls, routing decisions, API latency and failed lookups, and keep structured logs that make it possible to replay why a given call ended up where it did. When a customer says “I was transferred three times,” you can check exactly what happened instead of guessing.
How a project runs
- Discovery (one or two workshops): current call flows, systems to connect, availability and compliance constraints.
- Target architecture: component diagram, API contracts, routing rules and failure scenarios, reviewed with your team.
- Pilot on one call flow: one real journey implemented end to end and tested with controlled traffic.
- Phased rollout: flow-by-flow cutover with monitoring and a rollback option.
- Operations: documentation, knowledge transfer and, if you want it, ongoing support.
Timelines depend mostly on how many systems need to be integrated and how many call flows are in scope. We give you an estimate after discovery.
What to expect and prerequisites
What you get: a documented orchestration layer, APIs and webhooks your developers can use, readable routing rules you can change, and call monitoring.
What we need from you:
- access to your SIP carrier or PBX (SIP trunk or an interconnection to be defined);
- API or database access to the systems to connect, ideally with a test environment;
- a business owner to validate routing rules and a technical owner for hosting and security;
- your availability targets and data retention requirements (recordings, logs).
If you are weighing whether to extend your current platform or build a new one, we can walk through it in a free 30-minute consultation.