Multi-Tech Systems BL-Series manual 25bis Mode AT Commands, 25bis Responses Result Codes, 149

Appendix H - V.25bis Operation

V.25bis Mode AT Commands

The following commands will either alter standard V.25bis behavior (so you must be careful in their use) or they are not allowed, as indicated. All other commands can be used in V.25bis operation.

A	Not Allowed
A/	Not Allowed
A:	Not Allowed
D	Not Allowed
D...N	Not Allowed
$D	Alters Operation ($D1 in V25bis is direct call mode)
E	Alters Operation
&F	Alters Operation (removes modem from asynchronous V.42bis mode)
N	Not Allowed
N...N	Not Allowed
O	Not Allowed
P	Not Allowed
T	Not Allowed
U	Not Allowed
W	Not Allowed
X	Alters Operation (X0 no connect message, X1 connect message)
,	Not Allowed
;	Not Allowed
!	Not Allowed
@	Not Allowed
+++AT<CR>	Not Allowed

V.25bis Responses (Result Codes)

When in V.25bis mode (the AT$V1 command executed), your modem provides you with several responses which can help you follow the progress of V.25bis operations. These are similar to the Result Codes associated with AT Command mode operation. The V.25bis responses are in the form of three-character mnemonics as listed below:

INC	Incoming Call (same as RING indicator)
VAL	A valid V.25bis command has been attempted
DLCt	Call delayed for t minutes (number on Delayed list)
CFlrr	Call failure indicator where rr equals:
	et - Engaged tone (same as BUSY)
	nt - Call Answered but No Answer Tone
	ab - Call Not Answered
	fc - Number on Forbidden List
	ns - Number not stored in memory
	ua - User Abort
	nd - No Dialtone
	ff - Forbidden List full
LSNmm;dd...dd	Phone number in V.25bis memory
LSDmm;dd...dd	Phone number on the Delay list
LSFmm;dd...dd	Phone number on the forbidden list
CON ssss	Connection at ssss speed (if X1 in effect)

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