Excelltel MS Series - Chap 5 Maintenance&Troubleshooting; 5.1 Outgoing calls cant be made; 5.2 Outside calls cant dial in; 5.3 Intercom cant be made

MS Series PABX User Manual
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4.18 Call All Extension(Group Call)
Format: #88
Description: one extension can dial #88, then all other extension will ring
simultaneously, if any extension is picked up, can talk with the calling
extension, while the other extension keep ringing.
If Ext is in Direct-Dialing-Out mode, you should input: *# 88.
Chap 5 Maintenance&Troubleshooting
5.1 Outgoing calls can’t be made
1). C.O. line is set to special Extension;
2). Extension hang up improperly;
3). CPU and internal data is disorder caused by unstable power.
4). Call restriction class is 6.
5.2 Outside calls can’t dial in
1). The conjunction of C.O. line loose;
2). C.O. line was connected to other equipment;
3). No message recording at auto-operator mode.
5.3 Intercom can’t be made
1). Extension hang up improperly;
2). Extension number wrong.