Top 10 Best Relay Server Software of 2026

Asterisk can act as a relay hop for SIP signaling and as a mixer or pass-through for media depending on dialplan and channel settings. Media behavior is controlled through SIP channel configuration, RTP handling, and endpoint-specific options that affect where media is anchored and how NAT affects packet rewriting. Extensibility comes from loadable modules and dialplan applications, which lets teams add custom authentication checks, header processing, and call routing logic.

A key tradeoff is that Asterisk requires careful configuration to keep media paths stable when NAT devices change source ports and when symmetric NAT blocks direct traversal. It fits best in self-managed environments where teams already operate PBX or SIP routing stacks and need relay-like behavior for specific call flows or controlled deployments.

Oracle Communications Session Border Controller targets teams that already run telecom-grade infrastructure and need predictable behavior under boundary conditions. It supports SIP session handling with interworking controls, media path anchoring, and fine-grained traffic policy for inbound and outbound flows. Operational controls typically include configurable routing rules, detailed telemetry outputs, and audit-friendly configuration practices used in controlled change processes.

A notable tradeoff is that deep policy control and interworking require disciplined configuration and lab validation, especially when dialing plans and codec policies differ by partner. It fits best for environments that need controlled relay behavior at the network edge, such as enterprise or carrier interconnects that must enforce per-dialog rules while supporting multiple upstream trunks.

OpenSIPS routes SIP signaling using a policy engine that can match on headers, method types, and dialog state, then apply actions like forward, reply, or rewrite. It supports common operational integrations such as TLS transport for SIP connections and database-backed state for registrar and subscription flows. Deployments typically use a modular configuration with separate concerns for transport listeners, routing rules, and optional features like rate controls.

A key tradeoff is that OpenSIPS does not function as a media relay, so NAT traversal, ICE, and candidate relaying require separate TURN or NAT gateways in a real-time media path. OpenSIPS fits best when a team needs signaling-centric governance like relay ACLs, per-route authentication decisions, or geo-aware SIP routing ahead of application servers.

Twilio Network Traversal Service provides a TURN relay offering for NAT traversal, so WebRTC sessions can fall back to relayed media when direct paths fail. The service integrates via Twilio APIs to allocate relay resources and return connection parameters for client setup.

It focuses on relay endpoint provisioning and authenticated relay access rather than self-hosted relay operation. Teams also get programmable control over relay session behavior through request-driven configuration.

coTURN Docker runs a TURN server inside Docker containers to relay media and handle ICE connectivity for WebRTC clients. It packages the coturn daemon with container-friendly configuration patterns for realm setup, long-term credentials, and transport listeners.

A deployment can expose UDP and TCP relay ports and support TURN-over-TLS for encrypted relay paths. Operators can tune relay session timeouts and relay permissions through coturn configuration to control relay bandwidth behavior.

Prosody from prosody.im is a relay-focused messaging server that fits teams needing a controllable message routing hop for real-time clients. It supports routing rules, clustering, and transport-level configuration that affect how messages traverse networks.

Admin control is handled through configuration files and deploy-time choices rather than a dedicated web management console. The result is a relay deployment shape that emphasizes predictable behavior under governance constraints.

coturn provides TURN relay services used by ICE stacks during NAT traversal, with STUN for server-reflexive candidate discovery and TURN for relayed candidate paths.

Relay behavior is governed through TURN realm configuration, long-term credential parameters, and relay session timeout controls that affect allocation lifetimes.

Operational scaling typically combines multiple coturn instances with a load balancer and consistent listener and port planning to distribute relay traffic.

Janus WebRTC Server at janus.conf.meetecho.com is a turn-key WebRTC relay and gateway built around the Janus plugin model for handling media relays and data channels. It can allocate relay endpoints on demand, keep relayed media paths active for a session, and support ICE candidate traversal so endpoints behind NAT can connect.

The server is commonly deployed as a central relay hop that terminates DTLS transport and forwards media and messages across connected peers. Its core strength for relay use cases is extensibility through plugins that shape how sessions, transports, and message flows are managed.

Jitsi Videobridge relays and mixes real-time media for Jitsi-based conferencing deployments when direct paths fail. It handles UDP media forwarding with DTLS transport support so relayed flows can participate in the same ICE negotiation as peers.

The software ships as a server component that integrates with Jitsi’s conferencing stack for relay routing, bandwidth behavior, and operational control in self-hosted environments. Media relay is tightly coupled to the Jitsi ecosystem, which matters when using it as a relay server outside that stack.

mediasoup is a relay server for real-time media that focuses on in-process media routing rather than a hosted API service. It uses a plain data-plane model built around Routers, WebRTC transports, and Producers and Consumers that lets teams control how media flows and how sessions are wired.

The server can relay or forward media over multiple transports, including UDP and TCP, and it supports DTLS-SRTP for WebRTC. mediasoup’s integration hinges on a custom signaling layer that feeds RTP and ICE connectivity details into its worker and transport lifecycles.