Table of contents
User’s manual
SynJ SB67148  
DECT 6.0 4-line expansion deskset 
for use with AT&T model  
SynJ SB67118/SB67138
Getting started
Quick reference guide .............................. 1
Installation ...................................................... 4
Deskset installation .................................... 5
Backup battery installation .................... 6
Backup battery charging ......................... 7
Add and register a deskset .................... 8
Register the deskset to your SynJ 
SB67118 telephone base .................... 8
Register the deskset to your SynJ 
SB67138 telephone base .................... 9
Deregister a deskset ................................10
Deregister the deskset from your 
SynJ SB67118 telephone base ......10
Deregister the deskset from your 
SynJ SB67138 telephone base ......11
Add a corded headset ............................12
Add a corded headset to  
the deskset ...............................................12
Deskset settings
Deskset setup..............................................13
Menu settings ..........................................13
Ringer volume .........................................13
Ringer tone ...............................................14
LCD contrast ............................................15
Key tone .....................................................15
Language ...................................................16
Line selection ..........................................16
Deskset name ..........................................17
Hold reminder .........................................17
Speed dial setup ....................................18
Customer support .................................18
Deskset operation
Deskset basic operation ........................19
Line indicators .........................................19
Make a call................................................19
On hook dialing (predialing) ............20
Dial a speed dial number ..................21
Answer a call ...........................................21
End a call ...................................................21
Switch among the corded  
handset, the speakerphone  
and the corded headset ....................22
Temporary ringer silencing ...............22
Last number redial ................................22
Options while on calls ............................24
Volume control .......................................24
Call waiting ...............................................24
Mute .............................................................24
Call privacy ...............................................25
Record a call ............................................26
Hold ..............................................................27
Switch among lines ..............................27
Join a call in progress .........................27
Chain dialing ............................................28
Three-way conference calls .............28
COVM (central office voicemail) .....30
Intercom .........................................................31
Make an intercom call.........................31
Answer an incoming call during  
an intercom call .....................................32
Answer an intercom call ....................32
End an intercom call ............................32
Call transfer using intercom ................33
Push to talk (PTT) intercom .................35
PTT to the main telephone base  
or a system device ...............................35