DECT or Digital Enhanced Cordless Telecommunications is a digital communications standard primarily used for creating cordless phone systems.
DECT is more stable as it operates on its own isolated frequency. It will not compete with resources with lower communication priority.
WiFi operates on a shared network. It is shared by various resources which can make it unstable occasionally.
Better security in DECT as it comes with a full range of security protocols, authentication & encryption.
WiFi security has minimal authentication processes.
DECT has a better voice quality as it is designed purely for voice.
WiFi is designed for data. QoS controls are needed to prioritze voice quality.
DECT uses a lower frequency hence it is better at passing through obstacles (e.g walls, boxes, people).
WiFi uses a higher frequency which makes it harder to maintain signal strength when passing through obstacles.
DECT provides a cover range of 50m indoors; 300m outdoors.
Cover range for WiFi is limited to within the premise. Little to no coverage once out of premise.
DECT allows seamless handover between access points ensuring voice calls are free from interruptions.
There exists a break of 70ms before handover which means users will hear a break in conversation if they use WiFi.