This is an open discussion with info sharing, about VoIP Drupal and Doing Drupal for Good.

We will discuss many ways you can use it on your site to allow visitors to call and receive information, or your Website can call or text members using the Call Blast module. You can create an instant conference line, or setup a PBX style system where the caller can make choices on what extension they reach.
Each entity can have a unique phone extension. VOIP Drupal is a suite of modules that consists of core modules that interact with other modules such as roles and permissions to create a very flexible and granular automated system that can be triggered by actions.

The agaric team has launched the BETA version of PowerToConnect.com We are using VoIP Drupal to enable Event Organizers and participants to send and receive messages using a regular phone.
BoF organizers can send text updates to interested people that have signed up, or attendees can call 1 617 648-5578 and enter the extension of the BoF to hear updates, or subscribe to a Bof and receive txt updates.

Come help us test it out by posting your BoF session, or subscribing to one for DrupalCon Austin!

Some of the VOIP Drupal modules come with Blocks that allow you to choose the script and set the caller ID number etc. (The click2call module has blocks.)

VOIP Drupal is ready to install on your Drupal site, and you can get involved in the future development and testing of new functionality.

VoIP Drupal easily handles:
Instant Conference calls - no long PIN numbers
Group SMS text Notifications between members
Post Audio Blogs on your site
SMS text messages posted on your site
Group Voice Mail - answering machine
Out-calling for scheduled messages
Community call lists
Information hotlines
Story recording / playback
Language training
Audio tours Adventure games
Geo-based callblasts aimed at specific streets or locations

Much more than I can list here...

The VoIP Drupal platform was originally conceived and implemented by the MIT Center for Civic Media (http://civic.mit.edu/).