Latest Open-Xchange Groupware Offers Integrated VoIP

Open-Xchange, a provider of business-class open source collaboration software, today announced enhancements that give users telephone and fax integrated with e-mail, contacts, calendar and task information. http://bit.ly/dmykZW

Comments

[voip providers]

Of course there are different means of communication except of IP phone, but you should compare them to make the conclusion about their efficacy. After comparing you will understand that IP-phone is the most practicable for you or your company.
http://www.voip-catalog.com/ Voip providers.