In your iPhone go to Settings -> General -> VPN  -> Add VPN Configuration… 

See the settings below.  You'll need to contact ITS for the "Secret". 

ITS Knowledge Base

CentreNet FAQ

eWaste Recycling

Network

Printers

Email Setup

Office 365

Password

Malware Removal

VPN Setup

Miscellaneous

Technology Discounts

CentreNet

CX

Classroom Technology Tips

CampusPress Resources