# OpalParamSetUpCall Struct Reference

`#include <opal.h>`

List of all members.

## Public Attributes

const char * | m_partyA
const char * | m_partyB
const char * | m_callToken

## Detailed Description

Set up call parameters for several command and indication messages.

When establishing a new call via the OpalCmdSetUpCall command, the m_partyA and m_partyB fields indicate the parties to connect.

For OpalCmdTransferCall, m_partyA indicates the connection to be transferred and m_partyB is the party to be transferred to. If the call transfer is successful then a OpalIndCallCleared message will be received clearing the local call.

For OpalIndAlerting and OpalIndEstablished indications the three fields are set to the data for the call in progress.

## Member Data Documentation

const char* OpalParamSetUpCall::m_partyA

A-Party for call.

For OpalCmdSetUpCall, this indicates what subsystem will be starting the call, e.g. "pots:Handset One". If NULL or empty string then "pc:*" is used indication that the standard PC sound system ans screen is to be used.

For OpalCmdTransferCall this indicates the party to be transferred, e.g. "sip:fred@nurk.com". If NULL then it is assumed that the party that is not the pc or pots connection is to be transferred.

For OpalIndAlerting and OpalIndEstablished this indicates the A-party of the call in progress.

const char* OpalParamSetUpCall::m_partyB

B-Party for call. This is typically a remote host URL address with protocol, e.g. "h323:simple.com" or "sip:fred@nurk.com".

This must be provided in the OpalCmdSetUpCall and OpalCmdTransferCall commands, and is set by the system in the OpalIndAlerting and OpalIndEstablished indications.

If used in the OpalCmdTransferCall command, this may be a valid call token for another call on hold. The remote is transferred to the call on hold and both calls are then cleared.

const char* OpalParamSetUpCall::m_callToken

Value of call token for new call. The user would pass NULL for this string in OpalCmdSetUpCall, a new value is returned by the OpalSendMessage() function. The user would provide the call token for the call being transferred when OpalCmdTransferCall is being called.

The documentation for this struct was generated from the following file:

- opal.h