Siemens 300 Series 사용자 설명서

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ROLMphone 300/600 User Guide
Direct Trunk Select
Direct Trunk Select lets you choose a particular trunk 
(outside line) for placing a call.
To choose a 
trunk
Get a dial tone.
Press the Direct Trunk Select (DTS) key, or dial 
# # 8.
Dial the number assigned at the CBX for the 
specific trunk you want.
Dial the outside number.