• A Strategic Initiative to Advance America's Telecommunications Infrastructure

VoLTE Interconnect & IMS Peering

High-Definition Voice Interworking Across Global Mobile Networks

Overview

As mobile operators sunset 2G and 3G networks and transition fully to IP-based architecture, Voice over LTE (VoLTE) has become the new global standard for mobile voice. Yet establishing direct VoLTE interconnect between IMS networks remains technically complex, costly, and operationally fragmented.

USTelco provides a carrier-grade VoLTE interconnect and peering hub, enabling seamless, secure, and scalable VoLTE interworking for mobile network operators, MVNOs, and communication platforms worldwide.

 

What We Offer

VoLTE-to-VoLTE Interworking

Connect IMS networks directly with support for:

  • HD voice codecs (AMR-WB, G.722)
  • Full CLI presentation and identity preservation
  • ENUM/SIP URI routing and fallback handling

 

HSS Proxying and ENUM Translation

  • Diameter-based HSS/AAA interworking
  • ENUM/DNS resolution for SIP URI-based routing
  • IMSI-based routing for MVNO scenarios

Standards-Based Interconnect

Fully aligned with GSMA IR.65 and IR.92 to support:

  • Native VoLTE roaming
  • SIP signaling normalization
  • IMS interoperability across vendors and geographies

Integrated SBC Layer

  • Carrier-class SBC for signaling security
  • Media anchoring and NAT traversal
  • SIP protocol adaptation and interworking
  • CLI and fraud screening

Global IPX Backbone

Delivered over USTelco’s distributed IPX with PoPs in:

  • New York
  • Dallas
  • Frankfurt
  • Amsterdam
  • Singapore
  • Johannesburg

Why Interconnect with USTelco?

Use Cases

VoLTE peering between domestic and foreign MNOs

HD voice roaming enablement via hosted exchange

MVNO IMS interconnect without core investment

Secure VoIP-to-VoLTE handoff with CLI assurance

Technical Snapshot

Capability Details
Codecs Supported AMR-WB, G.722, Opus
Signaling SIP over UDP, TCP, TLS
Diameter Interfaces S6a, Cx, Gx, Rx
CLI Compliance STIR/SHAKEN-ready, SIP Identity (4474)
Routing Support ENUM, DNS, IMSI, SIP URI
QoS Transport IPX with Class Selector 4, DSCP tagging
SBC Security SIP normalization, DoS protection

Standards and Compliance

GSMA IR.65 / IR.92 / IR.88

3GPP TS 24.229 IMS Core

STIR/SHAKEN framework

RFC 4474, RFC 8224, RFC 8225

Connect to global VoLTE networks without the operational burden

Getting Started

USTelco handles the complexity—giving you fast access to interworking with leading IMS environments.

Ready to simplify global VoLTE interworking?

Let USTelco help you accelerate peering, expand reach, and deliver a superior voice experience — anywhere.