[Freeswitch-users] Hiding Tech Prefix from Caller

[Galen R. Lande]

I've tried searching for the solution to this problem, but I've come up empty.

I'm working with a gateway (FlowRoute) that requires a Tech Prefix be sent in the INVITE as part of the outgoing number.  I've implemented this in the dialplan as:

<action application="bridge" data="sofia/gateway/sip.flowroute.com/123456*$1"/>

While the call is successfully routed out, FreeSWITCH sends the same information back to the caller in the SIP transaction -- thus the caller's handset updates to read "123456*1231231234" instead of just "1231231234".  Not only is this something of a security concern (since the Tech Prefix is somewhat confidential), but it breaks many handset features such as redial.  The gateway requires the Tech Prefix in the INVITE header and will not accept it just in the "To" field.

Any ideas on how I can force FreeSWITCH to effectively hide the Tech Prefix from the caller?

Thanks!