I experienced the same issue and mine was resolved by changing the following parameterCallmanager Service parameter:Transform Forward by Reroute Destination : This parameter determines whether the called number transformations are applied to the call...

Have you tried the Callmanager service parameter1.Forward By Reroute Enabled : The parameter enables the Q.SIG Forward By Reroute feature. 2.Transform Forward by Reroute Destination : This parameter determines whether the called number transformation...

Hi Bibhu,As you are using third party softphone this will be very tough for u. But need to concentrate on softphone coding for tranfer or conference.