You require the PLDS connection to gain access to Avaya from where you can obtain all software and firmware files that are required for upgrade, migration, and updates. Ensure that you add the required ports and websites to the customer firewall. For example, you require access to the ftp.avaya.com website to get the versions.xml and http to grant access to plds.avaya.com. If the customer decides not to open PLDS in the organization firewall, an alternate source must be set to access the software. For example, if the customer wants to test the latest versions of software before using the software for production. By using the alternate source, the customers can get the software that is recommended by the analyze operation.