Downloaded from here. https://support.avaya.com/downloads/download-details.action?contentId=C2009119141326946074&productId=P0001.
One for CM (Communication Manager) and another for the system platform.
This CM (Communication Manager) service pack 18 [Final] is as on the link.
Latest Communication Manager 5.2.1 Service Pack (25,851,087 Bytes) -
File Name: - 02.1.016.4-21656.tar.gz
File Name: 02.1.016.4-21656.tar.gz, 5.2.x
Communication Manager 5.2.1 Service Pack 18 - 02.1.016.4-21656.tar.gz
This is the PLDS link to download the SP 18 patch 21656.
https://plds.avaya.com/poeticWeb/avayaLogin.jsp?ENTRY_URL=/esd/viewDownload.htm&DOWNLOAD_PUB_ID=CM000000588
How to get the system platform version:
- First run swversion on the system, platform.
- Then log into system platform
- Check on the web interface on which system platform version
- And or if once have access to command line type swversion.