Altigen AltiView Manual page 30

While AltiView dials the new number, the first party goes into Hold
Pending state, and you see a confirmation dialog box.
Figure 14. Confirming Conference Calls
3. After the third party connects, you can announce the conference by
clicking OK in the dialog box. If the third party does not answer, click
the Cancel button.
4. Click the Conference button again to initiate the three-way
conference. Both calls will be displayed as Conference state.
Figure 15. Conference Calls Displayed in Call List
To add another party, click the Conference button and repeat steps 2-4.
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