---
title: "Netsapiens SIM-Ring Calling Issues"
slug: "netsapiens-sim-ring-calling-issues"
updated: 2025-06-02T02:08:23Z
published: 2025-06-02T02:08:23Z
canonical: "kb.connecttoteams.com/netsapiens-sim-ring-calling-issues"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.connecttoteams.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Netsapiens SIM-Ring Calling Issues

Simultaneous ringing ("SIM-Ring" or "S-Ring") configurations in Netsapiens will send multiple INVITE messages, and these will each have the same Call-ID (by default). This can cause problems with processing these calls through the Teams connector and calls may get dropped.

Since Netsapiens v41, there is an option at a system level for the Core module to generate unique SIP Call-IDs for each of the S-Ring call legs since some termination carriers have issues processing non-unique Call-IDs.

This is configured by setting the new System Parameter <SRingUniqueCallId> to "yes".

The default for <SRingUniqueCallId> is "no" to preserve prior behavior.