Northern UTA220/UTA220k manual Connect Incoming Calls CIC, Indication Messages

V.25 bis Dialer Operation

After dialing, the UTA220 attempts to establish a synchronous connection with the remote UTA220. As in other synchronous modes, flow control and buffering are not used when V.25 bis is enabled. When the call begins the connection sequence, the UTA220 sends a Call Connect Indication (CNX) message.

Upon connection, the UTA220 raises the DSR pin and enters the on-line data mode.

Examples of valid dial commands are:

CRN 12055550123

CRN 1 (205) 555-0123

CRN 9 1-205-555-0123

Responses to the dial command are:

VAL

INVCU

INVMS

INVPS

INVPV

CFI

CFIDT

CFIET

CFIRT

CFIAB

Refer to Table 2 for a description of these response messages.

Connect Incoming Calls: CIC

This command forces the UTA220 to answer an incoming call if the port on which the call is received is configured for manual answer (the auto-answer option is set to off). No parameters are allowed. The DTE typically issues this command after receiving an INC indication from the UTA220.

Responses to the CIC command are:

VAL

INV

INVMS

INVPS

INDICATION MESSAGES

Indication messages are unsolicited messages sent by the UTA220 to indicate a special condition, such as an incoming call. These messages are described below.

Call Connect Indication: CNX

The UTA220 sends this message to the DTE to indicate that an incoming or outgoing call is physically connected end-to- end. The call connection sequence is then started. The DTE should not begin sending data until the call connection sequence is completed, which the UTA220 indicates by raising the DSR pin.

6-4 UTA220/UTA220k