Please realize this forum has very few members, and most of those members only come to check on the forum once in a while. So it will naturally take a long time usually for you to get answers.
You should arrange a time with other people to phone. I highly doubt you would want phone calls at 3 in the morning. Also this way, if people are going to call you can make sure the computer is not turned off and that Express Talk is running.
Please also realize Express Talk is primarily used in business environments to manage large phone networks that work over their computetr network. Therefore there are even less members here who have the intention of using the program to contact other people just for chats etc. The program is mostly used to connect to a central PBX/Switchboard like Axon which is highly sophisticated software for routing calls to their intended destination and to manage voicemail etc. for many (maybe hundreds or more) users.
If you are looking for people to talk to over VoIP. There are many voip services that are intended just for that and offer a public directory of hundreds of people to call, and this can be done through express talk.