Installation guide

BlackBerry Enterprise Solution 38
Step Action Description
3 The BlackBerry Enterprise
Server sends a challenge string
to the BlackBerry
Infrastructure.
When the BlackBerry Enterprise Server receives the BlackBerry
Infrastructure challenge string, it sends a challenge string to the
BlackBerry Infrastructure.
4 The BlackBerry Infrastructure
sends a challenge response to
the BlackBerry Enterprise
Server.
The BlackBerry Infrastructure hashes the BlackBerry Enterprise
Server challenge string with the SRP authentication key, a 20-byte
shared secret encryption key, using the keyed HMAC with SHA-1.
The BlackBerry Infrastructure sends the resulting 20-byte value
back to the BlackBerry Enterprise Server.
5 The BlackBerry Enterprise
Server sends a challenge
response to the BlackBerry
Infrastructure.
The BlackBerry Enterprise Server responds to the BlackBerry
Infrastructure challenge string by hashing the challenge with the
shared SRP authentication key.
6 The BlackBerry Infrastructure
sends an acceptance to the
BlackBerry Enterprise Server.
When the BlackBerry Infrastructure accepts the challenge
response, it sends a final confirmation to the BlackBerry Enterprise
Server to complete the authentication process and set up an
authenticated SRP connection between the BlackBerry
Infrastructure and the BlackBerry Enterprise Server. If the
BlackBerry Infrastructure rejects the response, the connection fails
and SRP closes the authentication session.
How the BlackBerry Enterprise Server and the BlackBerry Infrastructure handle
undeliverable messages
When a party sends a message to a BlackBerry device, the BlackBerry Infrastructure might not be able to deliver
the message to the BlackBerry device immediately in the following scenarios:
Scenario Result
The BlackBerry device state prevents
the BlackBerry device from sending
and receiving messages over the
wireless network. The BlackBerry
device user might change the
BlackBerry device state by moving in
and out of wireless coverage or turning
the BlackBerry device on and off,
preventing message delivery.
• The message expires if the message remains undelivered after
the timeout value set on the BlackBerry Infrastructure (7 days)
elapses or the connection to the BlackBerry Enterprise Server
is lost. The BlackBerry Infrastructure informs the source that
the message could not be delivered.
• If the BlackBerry Infrastructure receives a message to a
BlackBerry device that it cannot deliver after trying for 10
minutes, the BlackBerry Infrastructure informs the BlackBerry
Enterprise Server and deletes the message.
• The BlackBerry Enterprise Server requests notification from
the BlackBerry Infrastructure of when the BlackBerry device
changes state. When the BlackBerry device state indicates
that it can send and receive messages over the wireless
network, the BlackBerry Infrastructure notifies the BlackBerry
Enterprise Server and the BlackBerry Enterprise Server sends
any pending messages to the BlackBerry device.
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