While discussing how to process AT commands with a colleague,
we discovered that contrary to our belief the command
AT&W (store user profile) is not specified in V.250
(it only specifies ATZ and AT&F, which are related),
leaving us wondering - where is it specified then?
Update: Yes, we expected the command to have its origin in the Hayes command set, virtually all the basic syntax commands does. However, most of the Hayes command have been imported into formal standards like V.250 by ITU or 27.007 by 3GPP. Since V.250 did not import this command we were wondering that it might be because it was specified in some other standard.
And in any case other standards have defined various commands.
Here is an extract from a comment I put in the source code
when I were working with the AT+VTS command last year
(which has by the way the most non-standard
parameter syntax I have ever seen!).
The AT+VTS command originally originates from the standard TIA/EIA/IS-101, "Facsimile Digital Interfaces - Voice Control Interim Standard for Asynchronous DCE" from 1993 by Telecommunications Industry Association. This specification is now withdrawn and the AT+VTS command is now specified in ITU-T V.252 "Procedure for control of V.70 and H.324 terminals by a DTE".
Does anyone have a reference to a formal standard/documentation
(like above) that defines AT&W ? We are not just looking for
manufacturer documentation of some random modem (unless for the original Hayes modems).