On 09/13/2013 04:12 PM, jg wrote:
Is there a general recipe to avoid fraudulent calls under the
following conditions?
A receptionist transfers calls as a callee (customers are calling) and
as a caller (boss asks to call and then transfer to him), i.e. the
Dial cmd for the internal context contains "Tt". Then an outside call
would operate as a Local channel in an internal context after the
first transfer. If the internal context allows to dial outside, which
is quite common, then this can be abused by the outside caller.
An obvious solution is to disallow Local channels to call outside
lines, but there are some possible side effects if Local channels are
used explicitly. This would require adding a persistent channel
variable (the ones with "__").
create a separate context for outbound calls.
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