Unable to make PSTN calls

IniobongNkanga-8038 936 Reputation points
2025-02-03T11:54:33.44+00:00

Hello,

Please i need your help on this issue.

Unable to make PSTN calls.

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  1. JimmyYang-MSFT 56,571 Reputation points Microsoft Vendor
    2025-02-04T06:53:16.7633333+00:00

    @IniobongNkanga-8038

    To better assist you, could you please provide some additional information?

    1. Are you using a specific PBX or VoIP system (for example, Cisco Unified Communications Manager, Asterisk, Avaya, etc.)?
    2. Is the PSTN connectivity provided by a gateway, SIP trunk, or another type of connection?
    3. Are you getting any error messages or codes when you try to place a PSTN call?
    4. Has this issue been happening suddenly, or was it set up recently and never worked as expected?
    5. Have there been any recent configuration changes or network updates that might be related?

    In the meantime, here are some general troubleshooting steps you can consider:

    • Verify your trunk or gateway configuration. Check that the settings (such as SIP credentials, dial plan prefixes, or digital line configurations) are correct.

    • Ensure that your dial plan is correctly configured. The dialed number should be routed to the PSTN properly.

    • Check if there is any firewall or network rule that could be blocking the traffic for PSTN calls.

    • Review system logs or call detail records (CDRs) to see if there are any clues regarding the failure.


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