NEC SL2100 - 4.3.3 Repeat Dialing (Outside Call Only); 4.3.4 Answer Message Waiting (Terminal Indicator is Flashing Red)

Issue 1.0
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4.3 If Your Call Doesn’t Go Through...
4.3.1 Set Camp On / Callback
 Camp On In case of Intercom Call, when you hear ringing, wait for the
called party to answer.
In case of Outside Call, when you hear Dial Tone, begin telephone
number dialing.
 Callback In case of Intercom Call, when your terminal starts the
ringing, lift handset and wait for the called party to answer.
In case of Outside Call, when your terminal starts the ringing, lift
handset, hear Dial Tone, and begin telephone number dialing.
 This function is applicable in case all trunks are busy condition. (not
applicable for dialed outside party busy)
4.3.2 Cancel Camp On / Callback
Figure 20 Set Camp On or Callback
Figure 21 Cancel Camp On or Callback