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What is Subscription Management Secure Routing?


Subscription Management Secure Routing (SM-SR) is an important component in the remote management of eSIMs (embedded SIMs) in IoT devices. As more devices become connected, the ability to provision and manage them over-the-air, without physical access, is critical.

What is SM-SR

What is SM-SR

SM-SR provides a secure communications channel between eSIMs and the subscription management platforms that provision them. Specifically, SM-SR routes encrypted profile data and remote commands between the Subscription Manager Data Preparation (SM-DP) server and eSIMs.

The SM-SR works according to predefined business rules and policies to determine which operator credentials are installed on a device. It also enables profiles to be enabled, disabled, deleted, or swapped remotely during the lifetime of a device.

Benefits of Using SM-SR

Using SM-SR for eSIM management provides several key benefits:

  • Effective remote profile management – Enables over-the-air profile updates without physical access to devices
  • Network switching flexibility – Allows businesses to change operators for better coverage or rates
  • Enhanced security – Leverages encrypted channels for secure communications
  • Fallback connectivity – Ability to revert to previous network profiles if issues arise

SM-SR in Action

For example, if a business wants to switch an IoT device to a new operator profile, the SM-DP would download the new profile. Then the SM-SR would route that data to the eSIM securely and issue an activation command. This triggers the new profile while disabling the old one.


In summary, Subscription Management Secure Routing (SM-SR) facilitates efficient and secure eSIM profile management between servers and IoT devices remotely. It will continue to be an integral technology as more cellular-connected products are deployed globally.

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Lila Bennett

Lila Bennett, with 10+ years in eSIM tech, specializes in mobile connectivity solutions. She offers end-to-end eSIM services, from setup to support, for both businesses and consumers. Need eSIM integration or advice? Contact Lila anytime for expert assistance.