Dell Networking 7048 Reference Manual page 331

Syntax
switchport voice detect auto
no switchport voice detect auto
Default Configuration
This feature is disabled by default.
Command Mode
Global Configuration mode, Config mode and all Config sub-modes,
Interface (gigabitethernet, port-channel, tengigabitethernet) Configuration
mode
User Guidelines
This command has no user guidelines
Example
console(config)#interface tengigabitethernet 1/0/1
console(config-if-Te1/0/1)#switchport voice detect auto
331
Auto-VoIP Commands