Device Adapter uses the Sequential Registration feature to provide fail-over support for endpoints.
In Sequential Registration, only one endpoint can register at one time.
If a new registration request is received, Session Manager terminates an existing registration to register the new device. Sequential Registration is crucial for providing endpoint fail-over support and other useful operations.
Note:
Device Adapter supports Sequential Registration only for UNIStim endpoints.
Avaya Aura® supports Sequential Registration on the SIP phones that are capable of supporting the Sequential Registration feature.
The J-series 3PCC phones do not support the Avaya Aura® SIP messaging that is required for Sequential Registration. If a J-Series 3PCC phone registers to a Device Adapter station definition for Sequential Registration, the buttons do not map correctly. This leads to a major loss of function. Hence, Avaya recommends that you do not use a J-series 3PCC phone for Sequential Registration.
However, Sequential Registration is supported on a J-Series Avaya Aura® phone.
Sequential Registration provides the following fail-over and operational support:
An endpoint can re-register without waiting for the original SIP registration to fail. This fail-over mechanism minimizes the recovery time.
Sequential Registration is supported for UNIStim endpoints.
Sequential Registration also provides fail-over support for analog and digital endpoints that are on an MGC in an event of a network failure.
When the MGC detects a registration failure, then depending on the deployment model, the MGC tries to re-register the endpoint either on the same cluster or alternate cluster. Because the device ID is the same, Session Manager considers this request as a re-registration request rather than a new request and registers the endpoint.
However, the Sequential Registration feature itself is not supported for analog and digital endpoints.
Sequential Registration allows two or more UNIStim endpoints to act as a single user device. If one device is registered and another device tries to register, Session Manager terminates the registration of the first device and registers the second device. For example, the user can log in at a desk phone, then log in with the 2050 client on the laptop. Later, the user can log in by using the desk phone or use some other device. With every new registration, Session Manager terminates the previous registration.
Sequential Registration allows adding Avaya Aura® SIP phones. But, the user experience on these phones might be different than the Avaya Aura® user experience.
Sequential Registration allows a user to perform a Virtual Office login at a UNIStim endpoint since Device Adapter Release 8.1.1.
To configure Sequential Registration, set the MDA configuration fields to the following:
Set the Max. Simultaneous Devices value to 1.
Clear the Block New Registration When Maximum Registrations Active check box to allow new registrations. Session Manager terminates the registration of an existing device to register the new device.
Note:
However, selecting the Block New Registration When Maximum Registrations Active check box is the preferred method to provide fail-over support for digital and analog endpoints. Selecting this check box prevents an Avaya Aura® SIP device from trying to register sequentially to an analog or digital device.
