Since we have no sip trace to go on, or any other information about what rev of FreeSWITCH you're currently running we can only guess at this point.  I do know the behaviors of SRTP changed, If you're running master or 1.4 you can open up conf/vars.xml and read the extensive documentation on the changes and how they behave.

--
Brian West


Twitter: @FreeSWITCH , @briankwest

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On Jun 2, 2014, at 9:04 AM, Richard Mace <richard.mace@gmail.com> wrote:

Hi Michael,
Just ring extension 5000 from a sip client running Zoiper on a vanilla installation

Richard