OpenPhone 27 Handset User Guide
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.
2.Dial the Trunk Single Flash or Trunk Double Flash Feature Access code.
3.Wait for dial tone.
4.Dial the Centrex feature access code.
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