Cisco Cisco Computer Telephony Integration OS 8.5 Developer's Guide

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Chapter 10      Call Object
Methods
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CTI OS Developer’s Guide for Cisco ICM/IPCC Enterprise & Hosted Editions Release 7.1(1) 
If there are only two calls at the device, call this method using either the current 
or held call. For switches that allow more than two calls at a device (for example 
G3), make this request only through the desired held call to avoid the ambiguity 
caused by multiple held calls at the device. Otherwise, indicate the desired held 
call by using the optional parameter. 
The Transfer  request must be made via a call whose call status is 
LCS_CONNECT or  LCS_HELD or it will fail.
The following events are received by the transfer initiator if this request is 
successful: 
  •
OnCallTransferred event
  •
OnCallEnd event
  •
OnCallEnd event
  •
OnAgentStateChange event
  •
OnTransferCallConf event
The following events will be received  if this request fails: 
  •
OnControlFailureConf event