[Asterisk-Users] W&M Wink timings for Nortel

[Steve Underwood]

Hi Eric,

Eric Wieling wrote:

> Does anyone know the default E&M Wink timings for Nortel DID ports?
>
> The default settings on Asterisk are:
>
> ;    prewink:     Pre-wink time (default 50ms)
> ;    preflash:    Pre-flash time (default 50ms)
> ;    wink:        Wink time (default 150ms)
> ;    flash:       Flash time (default 750ms)
> ;    start:       Start time (default 1500ms)
> ;    rxwink:      Receiver wink time (default 300ms)
> ;    rxflash:     Receiver flashtime (default 1250ms)
> ;    debounce:    Debounce timing (default 600ms)

I had trouble with wink start (or delayed dial, or various other names 
for the same thing) a long time ago. I think the switch was an AXE. The 
spec said as soon as the seize came in I could start the wink. This 
turned out not to be true. I needed to wait a while, or the PSTN switch 
could fail to see the wink at all, even if I made it very long. From 
checking some old code it looks like finally I waited 100ms after the 
seize before winking. Of course, you have a different switch so the 
timings might be different, but extending the per-wink a bit seems work 
a try. Also, 140ms or 150ms is usually the minimum specified wink. It 
could be something is a bit borderline and a slightly longer wink is 
needed for reliability. Much longer winks are usually harmless.

Another thing might be worth checking, although it seems silly at first 
sight. Some people pulse wink from 0->1->0, and some from 1->0->1. It 
seems like nothing should work if this is the wrong way around, but I 
have seen things half work when this is wrong.

Regards,
Steve