[asterisk-dev] Need Sip channel notify other channel to answer call

[Derek]

Here is the scenario

sip call ---->  chan_sip -----> chan_unistim -----> phone

The sip call sends a SIP_NOTIFY Event: talk to chan_sip.  I need to have 
chan_unistim answer the call.

I have modified chan_sip.c to detect the Notify Event: talk.  I can do 
the programming in chan_unistim to respond to the request.

I need to know how to have chan_sip notify chan_unistim to answer the 
call.  All help is greatly appreciated.

Thanks,
  Derek