16位電話系統 4線入16出電話交換機,任何有線電話可配合使用 16路互通有線音訊對講 醫院 學校 辦公室 簡便操作容易

4 PSTN number
16 extensions
25 seconds self-recording for voice operator 
Type I & Type II Caller ID support 
Transfer music
Extension number elastic coding
3-way conference
Three-level lightning protection
Franchise dialing
Rating service
Pick up
Forced insertion
Self-reported extension number
Do not disturb
Location shift
Voice mail message recording
IVR voice navigation
ACD line up
Remote programming
Economic routing
Multiple ways to dial out
Automatically switch duty mode
Abbreviated dialing
Fax identification
Extension hotline
Personal extension lock
Call time limit control
One-click call switchboard
FSK / DTMF caller ID
Busy transfer
Internal line reservation
Group calling
Internal line status redial outside line
HCI system