[Asterisk-Users] TDM400P & Channel Group

[Rich Adamson]

> >Shouldn't [Asterisk] be smart enough to go to Zap/4 as the only available
> >port in the group [with a live trunk]?
> >  
> >
> Adam Goryachev wrote:
> 
> >No, asterisk doesn't do dialtone detection.
> >
> But this isn't an issue of dialtone detection but one of detecting 
> battery (a much easier task). Shouldn't (doesn't) Asterisk check for 
> battery on an FXO port before using the port? Shouldn't this be an 
> option? (Sorry but I haven't the time to look at the code not to mention 
> think about adding this if it isn't already there.)

Asterisk does not look for battery. Mark made a change to the code
about a year ago (I think shortly after the TDM card was released)
to detect it (since the TDM chipset has that capability). For whatever
reason, it created problems for some users and the change was
enclosed in ifdef's. I don't know if they remain in the code or yet
right now.