[asterisk-users] DAHDI and wait 'w'

[John Novack]

Jerry Geis wrote:
>     -- Attempting call on DAHDI/1wwwwww for 
> smvoice_callprogress at smvoice-dialout:1 (Retry 1)
> [Oct 16 14:36:42] WARNING[16408]: chan_dahdi.c:8132 dahdi_request: 
> Unknown option 'w' in '1wwwwww'
> [Oct 16 14:36:43] WARNING[16408]: chan_dahdi.c:1481 dahdi_enable_ec: 
> Unable to enable echo cancellation on channel 1 (No such device)
>
> Does DAHDI not know about the W ??? I think zaptel used to.
>
> I am trying to come off hook on port 1 of my card and wait 3 seconds 
> before my AGI runs.
>
> Is there something new for DAHDI instead of "w"?
>
> Jerry
>   
I suppose it is expecting too much to listen for dial tone before 
dialing, rather than doing a blind dial?
Dumb modems have been able to detect dial tone before dialing for many a 
year, but the "w" cludge seems the only way to CYA when a PSTN switch is 
slow to return dial tone.
This shortcoming has been built in  ( or not ) for many a  year, and no 
one who has the skills ( I certainly don't )  is interested enough to 
correct it.

Analog PSTN interfaces will be around for a long time. It deserves some 
attention.

John Novack
 

-- 
Dog is my co-pilot