Sonus has gotten high marks I hear from an upcoming report crafted by Infonetics that's all about the "Service Provider Next Generation Voice and IMS Equipment Market Forecast."
The Infonetics report named Sonus the market leader in a few categories including the worldwide trunk media gateway segment where they hold 16% of the total market and the high density gateway market with 22% of the total market.
This really bodes well for Sonus and their IMS-ready solutions. They currently support over 19 billion minutes of voice traffic per month and have installs at AT&T, AOL and Earthlink to name a few.