Block Spam Call in Google Voice :

Search engines incorporates a World wide Spam Selection process that will on auto-pilot direct cell phone calls, text messaging, and also voicemails via some of the volumes in the Search engines repository which have been recognized as junk e-mail towards the junk e-mail folder. Nevertheless you will have to enable this particular feature for this to operate.

To enable this feature:
1. Log on to your account at http://voice.google.com

2. Click the wrench icon and select Voice Settings.

3. Click the Calls tab.
4. Check the box next to Global Spam Filtering. at the bottom of the page. See screenshot below.

Note: If a number eventually ends up incorrectly proclaimed seeing that junk e-mail, you can actually unblock that through choosing the actual meaning and also pressing the actual Definitely not Spam option in your junk e-mail folder.
In the event you’ve proclaimed the phone as well as voicemail message seeing that junk e-mail within the Search engines Voice website, almost any long term cell phone calls on the mystery caller are going to be provided for the voicemail message, plus your telephones won’t ring. The voicemail message are going to be on auto-pilot put into the actual Spam folder. Just get the phone as well as voicemail message on the mystery caller, choose the checkbox alongside the phone call as well as voicemail message, and also click on the Spam option.

You can also mark a caller as spam when listening to your voicemails by pressing 8 at any time during the message.

Via : http://gvoice.info/block-spam-calls-in-google-voice/