[asterisk-users] [1.4] Failed callfile doesn't jumpto"failed"extension

[Gilles]

On Sat, 19 Mar 2011 11:29:36 +0100, Gilles <codecomplete at free.fr>
wrote:
>Thanks guys. After testing with a PCI card + Dahdi, and then with a
>Linksys 3102, turns out that neither jumps to the "failed" or "h"
>extension when the remote number is busy, ie. already engaged (with no
>support for callwaiting, ie. two-way calling)

After more reading about the Linksys, it turns out that changing
"Line-In-Use Voltage" in the "PSTN Line tab" from 30 to 54 enabled the
device to detect that the remote line is already engaged.

Does someone know how to modify this type of settings in Zaptel/Dahdi?
Does it require modifying + recompiling its source code?

Thank you.