Though Sonus has made great strides in the past year in extending the reach of its softswitch platform to the access portion of the network, the Insignus softswitch is still primarily a major presence on the trunk side of the network. This report contains insight and analysis of the product or service strengths and weaknesses, list of buying criteria and how the product or service fares in each category, and a comprehensive table of product or service metrics and specifications. This report is useful for purchasers who need to evaluate products, or as a source of competitive intelligence for vendors.