User:Sikon/SIP

While any SIP client and provider will do, WengoPhone supports a contact list and traditional IM networks (ICQ, Jabber/Google Talk, MSN etc.) and has the most intuitive interface out of all clients I tested.

Ubuntu users have Ekiga preinstalled, so they can just use that.

Steps:
 * 1) Download a version for your platform. Supported platforms: Windows, Linux, Mac, and a Firefox extension for Windows and Mac (but not Linux).
 * 2) Register. You will be prompted to register when running WengoPhone for the first time. Pick up an account, password and email, and you will be mailed a confirmation link, like with oh-so-many online registrations.
 * 3) Add a contact with the SIP ID CONFERENCE@gizmoproject.com.
 * 4) Call it.
 * 5) When prompted by the electronic operator, type the room number using the dialpad. The room number is 5240743.
 * 6) Wait for other users to join. It's like IRC: everyone can hear everyone.

(Ignore the "Conference" button on the toolbar, it's for three-person conferences only. So far.)

You can also call other users in peer-to-peer conversations, like in a plain old IM client. Just add them to the contact list by their SIP ID (or Wengo ID if they're also using Wengo). However, only one voice call may be active at a time; others must be put on hold.

Users of other SIP clients can call you by your SIP ID: username@voip.wengo.fr, where "username" is your Wengo ID ("lucidfox" in my example).

The combobox at the bottom is for quick calls without adding anyone to the contact list.