1) Welcome to the Party!
2) As you are obviously new here, I have some suggestions to help us all help you:
When you post, please post your entire configuration including (but not limited to) your installation method and vicidial version with build.
This IS a requirement for posting along with reading the stickies (at the top of each forum) and the manager's manual (available on EFLO.net, both free and paid versions)
You should also post: Asterisk version, telephony hardware (model number is helpful here), cluster information if you have one, and whether any other software is installed in the box. If your installation method is "from scratch" you must post your operating system and should also post the .iso version from which you installed your original operating system. If your installation is "Hosted" list the site name of the host.
If this is a "Cloud" or "Virtual" server, please note the technology involved along with the version of that techology (ie: VMware Server Version 2.0.2). If it is not, merely stating the Motherboard model # and CPU would be helpful.
Similar to This:
Vicibox X.X from .iso | Vicidial X.X.X-XXX Build XXXXXX-XXXX | Asterisk X.X.X | Single Server | No Digium/Sangoma Hardware | No Extra Software After Installation | Intel DG35EC | Core2Quad Q6600
3) Search eBay for: SIPURA Linksys SPA1001
This is just ONE example of such a device. There are plenty of others out there. This one's just easy. Be SURE it is NOT LOCKED! It is configured via a built-in mini-web-browser.
This device becomes a VOIP phone except it can connect to any generic phone from walmart with the regular wall-plug (it only provides the "conversion", you must supply the "phone"). Including cordless phones. About the size/shape of a pack of cigarettes. Can be connected to the local network and run a long phone wire (perhaps already built-in to your office?) to a location where you want the phone. Alternately it can have a long network cable to a workstation (perhaps already built-in to your office?) to a workstation and then have a short telephone wire to the phone. It can even be configured to link to a Vicidial server in another location.
4) Then you will use the Vicidial Manager's Manual to Monitor/Barge from the RealTime Screen (there are other methods, such as dialing directly into the conference, but this requires knowing the conference number).
Happy Hunting!