ITAPI3 Problems (transfer and dtmf)

See more:

application

telephony

ITAPI3

Hello.
First thank julmar to provide this tapi3 for managed code.
I am making a call control application with julmar itapi3 and a simple usb dial up modem (lsi usb2 soft modem). My application will receive calls and a voice menu will be played for user.According to user pressed digit, application will receive dtmf signals and will do asked operation.
For example if user press key 1, application will transfer(forward, redirect) call to a specified phone number. and if key 2 pressed it will be connected to operator on same line.
problems:
1-
I can receive and dial successfully. but problem is when i try to forward, or blindtransfer the call it raise error as below:

JulMar.Tapi3.TapiException was caught
  HResult=-2147221501
  Message=This method is not supported.

  Source=ITapi3
  ErrorCode=-2147221501
  StackTrace:
       at JulMar.Tapi3.TapiException.ThrowExceptionForHR(Int32 hr) in c:\users\mark\documents\work\julmar entertainment\projects\itapi3\itapi3\tapiexception.h:line 97
       at JulMar.Tapi3.TCall.BlindTransfer(String destAddress) in c:\users\mark\documents\work\julmar entertainment\projects\itapi3\itapi3\tcall.h:line 301
       at ITAPI3SAMPLE.Form1.btnForward_Click(Object sender, EventArgs e) in d:\DSource\DSource\Programming\Projects\TelephonySample\ITAPI3SAMPLE\ITAPI3SAMPLE\Form1.cs:line 270
  InnerException: 

why it is trying to access a file in path c:\users\mark\documents\work\julmar entertainment\projects\itapi3\itapi3\tapiexception.h
i dnt have any user named mark in my computer.

2-
It doesn't raise any event related to dtmf .none of events like gatherdigit, digitevent or toneevent.

3-
when i try to get calleridnumber with this line of code

lblCallerID.Text = e.Call.get_CallInfo(JulMar.Tapi3.CALLINFO_STRING.CIS_CALLERIDNUMBER);

it returns empty string.
what problem exactly.


Thank you!