[reSIProcate] How to send "100 Trying" to an INVITE message?

[C Y]

Hello,

I am finding that my reSIProcate stack (the UAS) is
not sending any "100 Trying" to an INVITE?
I am seeing that my Proxy Server is re-sending INVITEs
until reSIProcate responded with a "180 Ringing",
because there is no intervening "100 Trying". 

Is there a way to force reSIProcate to send a "100
Trying"?

Thanks.

Chee

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