Asterisk / Trixbox: listen to calls in progress

With Asterisk or Trixbox it's possible to listen to calls in progress made by other clients.

Insert the line below into "extensions.conf" inside a customized context. In Trixbox or @home write it into "extensions_custom.conf "under [from-internal-custom]

for example:

exten => _61XXX,1,ChanSpy(SIP/${EXTEN:2},q)

with as many X as number of figures or chars in "names" of your extensions (3 in this exemple)

After a reload, is sufficent to type on telephon keypad 61206 to listen the extension 206 call