Overview

Callr provides carrier-grade SIP and IAX trunking services with enterprise-level security and reliability. As a registered telecom operator, we offer direct fiber interconnections with Tier 1 carriers, eliminating intermediaries and ensuring low-latency, high-quality voice paths.

Technical Specifications

Our SIP trunking supports SIP over UDP, TCP, TLS (encrypted signaling), and SRTP (encrypted media). IAX trunking is available for environments where NAT traversal or bandwidth efficiency is critical. Elastic trunking lets you scale channels up or down on demand — no capacity planning or long-term commitments required.

Compatibility

Callr SIP trunks integrate with all major VoIP platforms: Asterisk, FreeSWITCH, Vicidial, FreePBX, 3CX, Obehotel, and any SIP-compliant softswitch or PBX. IAX support is available for Asterisk-based deployments requiring optimized bandwidth usage.

Key Capabilities

Instant provisioning via the Portal or API. Trunk groups with configurable number formats and channel limits. Per-IP authentication or credential-based registration. Real-time monitoring and CDR export for every call leg. Failover routing across multiple endpoints for high availability.

Use Cases

Contact centers scaling call capacity elastically. Multi-site enterprises consolidating voice infrastructure. CPaaS providers building on top of Callr's carrier network. VoIP resellers white-labeling SIP services.