Cisco Cisco Computer Telephony Integration Option 8.5 Developer's Guide

A server application specifies the new service type CTI_SERVICE_SERVER to identify itself as server 
application. The server application then registers each service that it wishes to provide by sending a new 
message, REGISTER_SERVICE_REQ, to the CTI Server. When a CTI client application requests a 
service that is provided by a server application, such as CallRecording, the CTIServer selects a registered 
server application and forwards the client request to the server application. If no server is registered for 
the desired service the client request is refused with an E_CTI_NO_SERVER_FOR_REQUEST error.

The server service optionally allows multiple server applications to supply the same service. The 
ServerMode registration parameter determines how a server is selected to handle a given request. All 
server applications that wish to provide the same service must use the same ServerMode:

Exclusive. The first server application to register the service is the only one to serve requests. All 
other requests to register a server application for that service are refused with an 
E_CTI_NO_SERVER_FOR_REQUEST.

Round-Robin. Multiple server applications may register the service. The server application that has 
been waiting the longest for a request of this service type is chosen to service the request.

Parallel. Multiple server applications may register the service. Every request is sent to all registered 
servers concurrently. Every server response is forwarded back to the requesting client.

Initially, the only service that server applications may provide is call recording by registering the 
“Cisco:CallRecording” service using a REGISTER_SERVICE_REQ message, defined in 

:

MessageHeader

Standard message header.  
MessageType = 143.

MHDR

8

InvokeID

An ID for this request message that 
will be returned in the 
corresponding confirm message.

UINT

4

ServerMode

The method the CTI Server is to use 
to select among multiple server 
applications that register to provide 
this service. All servers must 
specify the same ServerMode, one 
of the following values:

     0: Exclusive; 

     1: Round-Robin;     

     2: Parallel.

USHORT

2