Re: [hylafax-users] FaxDispatch problem (faxrcvd)

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Dariusz Dwornikowski wrote:

> ModemType:              Class1          # use this to supply a hint
> ModemResetCmds:         AT+VCID=1       # enables CallID display
>  

> CallIDPattern:          "NMBR="
> CallIDPattern:          "NAME="
> CallIDPattern:          "ANID="
> CallIDPattern:          "NDID="

If HylaFAX is initializing the modem and a RING and Caller*ID (per 
AT+VCID=1) arrives during that time, while the modem is being 
initialized, then the Caller*ID received then will not be usable by 
HylaFAX and will be forever missed if not retrieved in some other 
fashion.  This dilemma is true for all modems that I've used... and it 
will be especially prevalent when the modems are receiving many calls 
one-after-another.

To help cope with this situation *some* modems (like iaxmodem) have an 
AT+VRID=1 command which allows the DTE (HylaFAX) to recall the Caller*ID 
information from the modem when HylaFAX is ready for it.  So you can set:

 ModemRingResponse:  AT+VRID=1
 CallIDAnswerLength: 4  # (set this after the NDID and to the number of 
DID digits)

This will cause a RING after the modem is initialized to trigger an 
AT+VRID=1 command by HylaFAX which will, in turn, cause the modem to 
repeat the Caller*ID information.  HylaFAX will, then, parse that data 
and then will answer if it finds (and it should) the NDID response to be 
4 digits or more.

However, things can be improved even further beyond this by 
"busying-out" the modem during the initialization.  This may not work 
with other modems, but with iaxmodem you can do:

 ModemResetCmds:  ATH1
 ModemReadyCmds:  ATH0

This will take the modem "off hook" (effectively busying it out) during 
the initialization phase and should greatly reduce the chances of what 
we've come to call "glare" (RINGs appearing during initialization).  
There still may be a 2 or 3 second window where glare could occur, and 
it's possible that could be reduced to nearly nothing by doing:

 ModemOnHookCmd:  "ATH0\nATH1"

in conjunction with the above-mentioned ModemReadyCmds setting.  
However, I've never tried this.  Between the AT+VRID=1 and ATH1 usages 
as described I've eliminated the loss of Caller*ID/DID information with 
iaxmodem.

Lee.


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