[Freeswitch-users] Two FreeSWITCH Box IVR Call Transfer

[David Swardstrom]

If you are using SIP, then anything in the Headers in the SIP message are
subject to 
being examined by some 3rd party. They are not secure.
They could also be spoofed or intercepted and modified (man in the middle).

You can use SIPS, that is why it was designed. 
Don't know what kind of issue this would raise with carriers.

Another possibility since you control the original destination and the
actual destination system.
Use a common database, put a record into the DB that the call is being
transferred and 
use as the postd number the Key. Probably should put From (ANI), To (DNIS),
user info, 
and other information into the record.
On the receiving side, look up the entry/record, verify what can be
verified, the use the
information in the record to determine the user.
This is similar to the sophisticated capabilities used in some ACD
installations.
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