Pinger, a startup based in San Jose, California, aims to challenge Skype (and others) by offering free voice calls. They are doing so by piggybacking voip on their hugely popular TextFree application, which allows sending free text SMS messages.
TextFree is unusual in that each user gets its own phone number, thus the 8 million TextFree users are in fact 8 million phone numbers (putting Pinger in the Top 10 US mobile carriers). For comparison, Q3 2010 Pinger distributed 1.7 million phone numbers, AT&T distributed 1.6 in the same time span.
Their current revenue model is ad-based, showing ads while the user is composing her message. As an indicator of profitability, the startup has already been backed up by venture firm Kleiner Perkins Caufield & Byers and others by raising more than $11 million.
Pinger is currently serving 1.2 billion ads and sent 4 billion messages each month and is only expected to raise its numbers. As Pinger’s target audience is between 16 and 26, advertisers are already eager to participate to set buying habits and brand loyalty as these users turn into adults.
For phone calls, users will have a limited amount of free monthly minutes, which they can increase by downloading other apps, completing 3rd party offers (a model coming from social media games) or by credit card payment. Pinger says that they are aiming to offer a worldwide service, disrupting the mobile industry and profiting from the huge markups phone carriers apply in their prices. Time will tell if they are able to make it.
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VoIP and unified communication service providers – 
Broadvox will benefit from the increased utilization of its network backbone and the ability to enhance its carrier, SMB and SME offerings with the Cypress Communications’ unified communications suite of services. 
Hosted unified communications provider Cypress Communications is known for helping to define the unified communications as a service (UCaaS) category and has been providing hosted communications to small and mid-sized businesses and enterprises (SMBs and SMEs) for more than 25 years. 
The ONE is compatible with Windows, Linux and Mac environments and is equipped with robust web security through HTTPS and call security through TLS and SRTP. It supports mixed IPv4/IPv6 LAN and WAN environments and comes with an automatic blacklisting feature that makes it possible to expose public IP addresses.
"Polycom’s reliable, cutting edge offerings will be a valuable addition to our IP phone portfolio and a tremendous vehicle for enabling our Virtual Office customers to experience and benefit from technological advancements such as HD Voice," he said.  
Two weeks after 

In the second half of 2011, Avaya and Skype plan to deliver integrated unified communications and collaboration solutions for enterprises within the U.S. The integration is intended to establish federation between Avaya Aura and Skype communications platforms and both user communities, so that an Avaya end-user and Skype user can engage and interact via presence, instant messaging, voice and video. 
According to a recent survey undertaken by the Customer Experience Foundation (CEF) on behalf of 
Other key survey findings include: