NEC 5330 IP - Manual (Page 70)

5330/5340 IP Phones – User Guide
70
Trunk Flash
The Trunk Flash feature allows you to access Centrex features (if available) while you are
talking on an outside call.
To flash a trunk while talking on an outside call:
1. Press the key you have programmed to Flash.
Note: You can program a key to single flash or double flash.
2. Wait for dial tone.
3. Dial the Centrex feature access code.