The vSTP SFAPP sends default response in case of the following scenarios:

• SFAPP thread CPU utilization exceeds congestion level

  Check if the SFAPP thread CPU utilization exceeded Congestion Level 2. This check is performed at the beginning of the message processing cycle and if set, vSTP immediately responds with default response.

  The equipment status value set against eirDefRespInErr option of EirOptions table is sent right away.

• SFAPP operational state

  Check if the SFAPP operational state is Unavailable. vSTP performs this check before sending the message to UDR and if the state Unavailable, the default response is sent and the query is not sent to UDR. The VstpSfappCATimeOut meal is pegged in this scenario.

The following points must be considered while configuring SFAPP over vSTP:

• The J1 and ATM interfaces are not supported.
• Single vSTP MP VM can support only one 4-Port ADAX HDC3 Card.
• An ADAX HDC3 card cannot be accessed from Multiple VSTP MP VMs .
• The ADAX HDC3 driver components and RPMs needs to be installed separately.
• The DSR patch is required to be applied on vSTP MP VM that is connected to ADAX HDC3 card.