Re: [hylafax-users] How to get around "Stop and wait" failures

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

On 2005.02.16 07:22 Sebastian Birnbach wrote:
> All,
>
>
> it took me quite a while to figure this out, so I guess the best 
> thing will be to post it to this list.
> After setting up Hylafax 4.2.1 (own compilation) on Solaris8 and 
> trying to make it work with a Robotics Sportster faxmodem, I kept 
> getting errors like this in the logs (/var/spool/hylafax/log/c0000*):
>
> [...]
> Feb 16 15:20:06.14: [  528]: SEND file "docq/doc29.ps;00"
> Feb 16 15:20:06.14: [  528]: USE A4 page width (215 mm)
> Feb 16 15:20:06.14: [  528]: USE A4 page length (297 mm)
> Feb 16 15:20:06.15: [  528]: USE 3.85 line/mm
> Feb 16 15:20:06.15: [  528]: USE 1-D MH
> Feb 16 15:20:06.15: [  528]: SEND training at v.29 9600 bit/s
> Feb 16 15:20:06.15: [  528]: <-- [9:AT+FTH=3\r]
> Feb 16 15:20:06.29: [  528]: --> [7:CONNECT]
> Feb 16 15:20:06.29: [  528]: <-- data [23]
> Feb 16 15:20:06.29: [  528]: <-- data [2]
> Feb 16 15:20:08.03: [  528]: --> [7:CONNECT]
> Feb 16 15:20:08.03: [  528]: <-- data [6]
> Feb 16 15:20:08.03: [  528]: <-- data [2]
> Feb 16 15:20:08.73: [  528]: --> [2:OK]
> Feb 16 15:20:08.73: [  528]: <-- [9:AT+FTS=7\r]
> Feb 16 15:20:08.99: [  528]: --> [5:ERROR]
> Feb 16 15:20:08.99: [  528]: MODEM Command error
> Feb 16 15:20:08.99: [  528]: Stop and wait failure (modem on hook)
> Feb 16 15:20:08.99: [  528]: The destination appears to have trouble 
> with V.34-Fax.
> [...]

Well, that V.34 error message is a bit loopy.  I'll look into that.

> Interestingly, the /usr/local/sbin/probemodem script had previously 
> detected that the AT+FTS command could not be digested by my modem. 
> You can run that script at any time to find out what AT capabilities 
> your modem has.

> I hope this helps other people, and if there is any HylaFAX developer 
> reading this, you may want to check if this is not a bug during 
> automatic modem configuration and setup.

The AT+FRS/FTS commands only work when the modem is off-hook.  So it's 
not possible to detect whether or not they work on a modem during the 
probemodem/faxaddmodem period.  Modems that *do* support those commands 
are supposed to report ERROR at those times, too.

Lee.

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