Application
- Your application
- Agents, workflows, models, ASR/TTS, and customer experience
- HD Carrier operates
- Third-party endpoint connection to the telecom network
The HD Direct platform
A known voice path from your application to the mobile network
Connect your existing SIP infrastructure to major US carriers through a direct IP path designed to reduce intermediate hops, preserve call data, and carry AMR-WB audio where supported.
Not a guess. A known path.
Fewer handoffs. More control over the signal
Traditional least-cost routing can pass a call through multiple downstream providers. On eligible HD Direct routes, CarrierX connects on-net to the destination carrier without secondary carrier hops.
- A clearer, deterministic path on supported routes
- Less avoidable transport latency
- Fewer codec conversions and handoffs
Technical clarity
What the platform does and what stays yours
HD Carrier strengthens the telecom path without asking you to replace the application layer that differentiates your product.
Routing
- Your application
- Endpoint and traffic policy decisions
- HD Carrier operates
- Trunks, trunk groups, DIDs, and eligible direct carrier paths
Media
- Your application
- Codec support inside your environment
- HD Carrier operates
- AMR-WB negotiation and transparent transcoding when required
Trust data
- Your application
- Authorized use of calling numbers and application policy
- HD Carrier operates
- Preservation and handling of STIR/SHAKEN information through the path
Configuration, route availability, capacity, and commercial terms vary by account and traffic profile. Confirm the production architecture with the HD Carrier team and current CarrierX documentation. Read the current CarrierX HD Direct documentation.
Platform capabilities
Carrier infrastructure that fits your existing stack
HD Carrier is the direct telecom layer beneath the application. Keep control of your product while CarrierX HD Direct handles the route into the mobile network.
Direct carrier interconnections
Inbound and outbound calling over direct interconnections currently including AT&T, T-Mobile, and Verizon.
AMR-WB wideband audio
HD Direct uses G.722.2 AMR-WB, with automatic codec negotiation and transparent transcoding when an endpoint cannot accept HD audio.
STIR/SHAKEN preservation
End-to-end IP connectivity preserves attestation information through the path so downstream systems retain useful provenance data.
Inbound and outbound voice
Attach DIDs to trunk groups and use the same third-party endpoint architecture for calls entering or leaving your application.
Failover and round-robin
Prioritize endpoints for failover or distribute traffic with weighted round-robin routing across your application infrastructure.
Portal and REST API setup
Provision phone numbers, endpoints, trunks, and trunk groups through the CarrierX portal or Core API.
From sandbox to production
A controlled path to live traffic
Telecom resources are issued after company and use-case review. The process protects customers, carriers, and the network while giving qualified teams a useful technical evaluation.
- 01
Share your use case
Describe your company, intended traffic, target carriers, current SIP environment, and the result the evaluation needs to prove.
- 02
Connect an endpoint
Point a CarrierX third-party endpoint to the public IP address or domain used by your existing SIP application.
- 03
Configure the route
Create a trunk group, assign the endpoint and DID, and choose failover or round-robin behavior for the environment.
- 04
Test, then scale
Validate inbound and outbound calls, codec negotiation, quality, latency contribution, and call data before moving production traffic.
Bring your voice stack
Test the application you already believe in on a better path
Use a qualified sandbox evaluation to inspect route behavior, codec integrity, call data, and conversational quality with your own infrastructure.