104 | Communication Conditions |
Dial modes |
Connectable lines (2-wire)
❖Ordinary analog telephone lines with direct connection
❖Corporate analog lines connected to a PBX
❖Analog lines connected to a PBX, which, for example, provide dial tone when the handset is picked up and permit outgoing calls by dialing 9.
Unconnectable lines (4-wire)
❖Business or home telephones that are connected to a key service unit or a PBX.
WARNING: These are digital lines that can damage the modem.
Lines that require pressing the (Line) button, for example “0,” before dialing.
Dial modes
There are two types of dial modes, pulse dial and tone dial. Generally, pulse dial lines are associated with rotary phones, but there may be cases where a push button phone is connected to a pulse dial line, so it is not possible to identify the type of line simply by looking at the phone. If you are not sure what type of line you are using, check an ordinary direct line by the following AT command, where n is the outside number:
ATDTn Enter
If you connect to the dialed number, the line is tone dial type. If you do not get a connection, it is pulse dial type.
The command ATDP will connect a pulse line.