We are currently facing a critical issue in our network of GSM gateways and SIM banks dedicated to VoIP GSM termination. Our SIM cards are unexpectedly ceasing to make calls, and we’re seeking the community’s expertise to help us troubleshoot and resolve this problem.
Here’s a brief overview of our setup:
- We operate a network of GSM gateways and SIM banks for VoIP GSM termination.
- Our system involves converting VoIP calls received via SIP protocol to GSM, connecting the caller and callee seamlessly.
- The infrastructure runs on a CentOS-based server using the Asterisk system.
The issue at hand:
- The SIM cards we employ for the GSM termination suddenly stop connecting calls.
- Despite receiving VoIP calls via SIP without any issues, the problem arises when we convert the call to GSM using our SIM cards.
- Our assessment suggests that the IP, server, and related infrastructure are not compromised or tampered with.
- However, we suspect that call-related logs might be utilized to block our SIM cards.
- We continue to receive VoIP calls from customers seamlessly.
- The problem arises only when converting calls to GSM using our SIM cards.
- Switching to a different SIM temporarily resolves the issue, but the problem reoccurs after a while.
We kindly request the community’s assistance in diagnosing and resolving this issue. Any insights, suggestions, or experiences related to similar problems would be greatly appreciated.
Thank you in advance for your time and expertise.