[asterisk-users] Monitoring second leg being dialed?

[Alec Davis]

> Thanks for the confirmation. Too bad Dahdi doesn't provide 
> call supervision so that Asterisk knows if/when the callee 
> has answered.
> I'll experiment and see how it goes.

DAHDI with an FXO card can support call answer/hangup supervison.

Check out chan_dahdi.conf options;

answeronpolarityswitch=yes
hanguponpolarityswitch=yes

However for this to work with an FXO card, the line from the telco does need
to provide the line reversal.

OT but related, an FXS port can also provide answer/hangup line reversal for
an upstream device, by setting the same options above for an FXS port.

Alec