I cannot make pc-pc calls in YM9.0

• Download the voice and video chat plug-in, quit all open browser windows, and install the plug-in.
• Sign in to Gmail, iGoogle or orkut.
• In your chat list, select the contact you want to call. If they have a camera icon next to their name, you can make a voice or video call to them; just click the camera icon to place a video call or the phone icon to place a voice call.

If your friend doesn't have a camera next to their name in your chat list, you can invite them to download the voice and video chat plug-in from the Video & more menu in a chat window. Even if your friend doesn't have a video camera, you can still have a voice chat or a 1-way video chat.

try http://au.messenger.yahoo.com/download/

you and your partner need yahoo messenger which have video call facility ask your friend to install same yahoo as you using


This will help. Thanks please keep updated. please do rate the solution positively .Thank you for using Fixya

Regards
Manish

hi friend,
Voice Save money and talk for hours! Make free PC-to-PC calls around the world to friends on Yahoo! Messenger.
Select a friend in your contact list and click the Call button to get started. You and the friend you call both need Yahoo! Messenger, plus a microphone and speakers (or headset). If you own a laptop, you probably have these tools already built-in. If not, head over to Yahoo! Shopping to check out some headsets.
Free PC-to-PC calls are unlimited and the quality is so good that you won't believe it's free! PC-to-PC calling is currently available in the following versions of Yahoo! Messenger: Windows, Mac.
If your friend is not available, you can leave them a free Voicemail. You can also receive voice mails from friends who miss you when they try to call. Voicemail messages are delivered as attachments in email to the address you choose.
Call regular and mobile phones too Sign up for a Yahoo! Voice Phone Out account to make calls from Yahoo! Messenger to your friends' regular or mobile phones worldwide for as low as 1¢ a minute. Find out more.
Forward calls to your mobile or land line If you don't want to miss calls, even when you're signed out, use the call forwarding feature to send incoming PC-to-PC calls to another phone number like your mobile phone (Yahoo! Voice Phone Out account required). The call is still free for your caller, and you only pay the Yahoo! Voice per minute rate for the forwarded call (as low as 1¢ a minute).
Get a phone number for Yahoo! Messenger Need an extra phone number to give to friends and family? Sign up for a Yahoo! Voice Phone In account and get a local phone number that friends and family can use to contact you through Yahoo! Messenger. Even if you're away from your PC, they can leave a Voicemail for you, or you can forward your incoming calls to another number, like your mobile phone. Find out more.
* Please note: 911 and other emergency service numbers currently cannot be accessed through Yahoo! Messenger or Yahoo! Voice services. You must use a traditional land line or mobile phone to access 911 or other emergency service numbers. Internet access and compatible PC required. Intended for use by U.S. residents only. Yahoo! Voice Phone Out and Phone In services are provided by Yahoo! Communications USA Inc., must be purchased separately and require you to download Yahoo! Messenger version 7.5 or higher. See additional terms and conditions during registration. Calls to mobile phones or other wireless devices may be charged at higher rates than calls to traditional land line phones. Additional fees and taxes may apply. All rates, promotional or otherwise, are subject to change at any time without notice. Please see Yahoo!'s most current rate table at: http://voice.yahoo.com/phone_rates.php. PC-PSTN calls are billed in one-minute increments. PC-to-PC calling between Yahoo! Messenger customers is free. Check with your internet service provider regarding any fees you will be charged to access the internet.
hope this helps u
please rate me........................
thank u for using fixya
regards
sivaranjini

Normal 0 Also send this to your family and friends so they have their computer setup properly.
Web Camera’s have to be setup on the program they are to be used with. Just installing the camera on your computer does not set it up to broadcast on messengers or Skype.
Each program has Options that have to be setup in order for the Audio and Video to function properly.
Yahoo Setup:

After downloading and installing Yahoo Messenger (http://www.soft32.com/download_30.html ) set it up as follows:

1. Go to Messenger at the top left and click on it.
2. Next go down to Preferences and click on it.
3. Next Calling and Devices on the right and set the Microphone and Speakers to the computer Audio Card.
4. Next go to the Test Audio section and (in blue writing) click on “Open the call setup assistant” and follow the instructions on the left window.

Hope this helps. Bud

Try Skype, superb audio quality plus chat and lots more

When you have the Yahoo! Messenger 9 window open (with your friends and whatnot) go to Messenger, and then Yahoo! Chat. A sidebar will come up next to Yahoo! Chat with the options Join a room, create a room, and favorite rooms. From there you can choose which you want to do.

I installed the most recent version of Yahoo! Messenger 9 just now and that's how it's set up for me. :)

Hope that helped. Have a great evening and please don't forget to rate this solution.

install new version of yahoo messenger from filehippo.com

EVEN THE WHOLE WORLD HAVE THIS PROBLEM .ONLY THE THING YOU CAN DO IS TO MAKE CALLS USING THE OPTION (INVITE TO CONFERENCE)YOU CAN SEE IT IN ACTION MENU IN YAHOO MESSENGER 9.0.YOU WILL BE ABLE TO CHAT AND TALK WITH ALL YOUR FRIENDS AT THE SAME TIME.IT SOMETIMES GIVES MORE CLARITY THAN MAKING A CALL.

Dont use yahoo messenger for ACER ASPIRE ONE not compatible, I suggest use SKYPE messenger text chat, video and voice call as well work great.

Yahoo messenger work only video and text chat only but voice call not work.

Skype messenger works video and voice call works perfectly.