Am running asterisk v1.4.2 with around 20 Grandstream Budgetone IP phones through 5 zap lines. I had enabled the TRANSFER features on the phones, but then one “curious” user demonstrated to me how he could blind transfer a call to an outgoing line (i.e. bridging together two zap lines), leaving himself out of the loop. (Yes, I do have canreinvite set to yes)
Any thoughts on how to prevent this? The only approachI can think of is to disable the call features on the phones, and then use the transfer capabilities in the features.conf file combined with the TRANSFER_CONTEXT variable somehow to limit transfering to internal calls only.
If anyone knows of a better/more elegant method (or indeed has an example of my guessed direction), I would certainly be interested!! It would be nice if the users could still use the big shiny TRANSFER button…
All the best,