Multi-device access and Sequential Registration problems

Last Updated : Feb 17, 2020 |
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Multi-device access (MDA) allows a minimum of 2 up to a maximum of 10 concurrent device registrations.
Because registering two or more UNIStim endpoints with the same TN is non-deterministic in MDA, Avaya recommends that out of the 10 SIP endpoints only one endpoint should be a Device Adapter UNIStim endpoint. If a user wants to share the same user identity for two or more UNIStim endpoints, you must use Sequential Registration to ensure that only one UNIStim endpoint is registered at one time.
For Sequential Registration, set the maximum number of concurrently registered devices to 1.
  1. If call failure occurs when two or more Device Adapter UNIStim endpoints are configured, do the following:
    1. Ensure that Max. Simultaneous Devices is set to 1.
      ADDITIONAL INFORMATION:
      Any environment where multiple Device Adapter UNIStim endpoints try to register must be configured for Sequential Registration. Multi-Device Access is not supported.
    2. If you have allowed new registrations when the maximum number of registrations is reached, ensure that Session Manager ends an already existing registration if a new registration request is received.
  2. If call failure occurs for digital or analog endpoints, do the following:
    1. Ensure that Max. Simultaneous Devices is set to 1.
    2. Ensure that the Block New Registration When Maximum Registrations Active check box is selected.
  3. In case of a slow recovery after a network failure, do the following:
    1. If you have allowed new registrations when the maximum number of registrations is reached, ensure that Session Manager ends an already existing registration if a new registration request is received.
      ADDITIONAL INFORMATION:
      Otherwise, a network failure between an endpoint and Device Adapter or Device Adapter and Session Manager retains the original registration until the keep-alive signaling detects the network failure. UNIStim endpoints can register only after the failure is detected.
    2. Ensure that Session Manager 1 and Session Manager 2 are configured correctly, and that the destinations are valid Device Adapter clusters, that is, primary and backup.
    3. Ensure that Device Adapter is correctly configured for primary and backup Session Managers.
  4. To troubleshoot MDA and Sequential Registration problems in Device Adapter, run the TraceSM utility on Session Manager to collect and examine the tDSA tCSDK debug logs.