First, Flexible, Forward-thinking Unified Messaging — that's AVST

For 20 years, AVST has designed the most feature-rich Unified Messaging solution on the market. Don’t just take our word for it, leading industry analysts have consistently rated our Unified Messaging solution as best-of-breed in the marketplace.

Best-of-Breed Unified Messaging Solution:

  • Ability to deliver unified messaging to multiple e-mail systems (premise-based and public cloud) including Microsoft Outlook and Office 365, Lotus Notes, Google Gmail, Novell GroupWise and any IMAP4 compliant e-mail system
  • Supports multiple e-mail servers simultaneously
  • Integrates e-mail, voicemail, and fax into a single view
  • Access via mobile device, e-mail client, web interface, speech or DTMF telephone
  • Offers flexible storage model options to meet organizations security, compliance, and confidentiality needs; Server-based unified messaging, Client-based unified messaging, Secure unified messaging and Simplified unified messaging
  • Voicemail-to-Text (3rd party service)
  • Text-to-Speech
  • Localized desktop clients

Unified Messaging leader for the most complete solution.  AVST took the top spot for the most complete unified messaging solution on the market today when evaulated against 16 other unified messaging providers.Find out more about the "Evaluating Unified Messaging Solutions 2008" by COMMfusion LLC at

Architecture: What's Your Favorite Flavor of Unified Messaging?

CallXpress is the most flexible Unified Messaging solution on the market today, allowing enterprises to choose how they deploy and use Unified Messaging. Unlike other solutions, CallXpress lets administrators deploy any type and mix of Unified Messaging as well as to combine Unified Messaging and traditional voice mail users on the same system, via simple configuration changes. CallXpress supports all four of the popular Unified Messaging architecture types; Server-based Unified Messaging, Client-based Unified Messaging, Secure Unified Messaging and Simplified Unified Messaging.

Server-based Unified Messaging

All messages — voice, fax and e-mail — are placed into a single store on the e-mail server. This allows users to access their voice messages from whichever e-mail client they choose — including desktop e-mail program, telephone, web-based e-mail access program and their PDA e-mail program.

  • Ideal for mobile users
  • Easiest to use remotely with a laptop computer
  • Fully leverages e-mail system features (e.g. Archive)
  • Supports the widest range of interfaces and devices

Server-based Unified Messaging
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Client-based Unified Messaging

Voice and fax messages remain on the CallXpress system, while e-mail remains on the e-mail server. This dual message store version of Unified Messaging integrates voice and fax messages access from their desktop e-mail client and telephone while minimizing the impact on the LAN and e-mail message store.

  • Ideal for companies that require separate message stores
  • Less of a traffic load on the network
  • Less storage load and activity on the e-mail server
  • Non-Windows operating systems support for clients
  • E-mail server independence

Client-based Unified Messaging
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Secure Unified Messaging

With Secure Unified Messaging, the voice and fax messages remain on the voice mail server, e-mail remains on the e-mail server. Using Web PhoneManager, users can access their voice and fax messages through a web browser such as Internet Explorer or Firefox. Users can access their messages through the web client, play the messages through their telephone speakers or play their messages over the telephone. For secure access, administrators can enable specific security features for specific users including using secure audio streaming to deliver the messages to the web client and restricting the ability to save a copy of the voice message on their local systems.

  • Ideal for business who need to keep voice messages secure
  • No local copy of voice mail
  • No forwarding capability outside the company
  • Web client access to voice messages
  • No client install
  • E-mail server independence

Secure Unified Messaging
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Simplified Unified Messaging

Copies of voice and fax messages are sent to the user at a specified e-mail address as e-mail messages with attachments, while the original messages remain on the voice and fax servers. The two copies of the messages — the one on the voice server and the one in the user's e-mail inbox — are not synchronized in any way. Therefore, each message must be deleted separately.

  • Ideal for SOHO users or small business
  • Works with hosted e-mail providers
  • Supports any e-mail system, including IMAP4 and POP3
  • Supports notification to mobile devices

Simplified Unified Messaging
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"Our employees rapidly embraced the unified messaging functionality in CallXpress and reported they hope to never go back to the old way of conducting business. Unified messaging has spoiled them!" Amerisure

The 5 C's (Considerations) for Unified Messaging

AVST's experience designing and delivering Unified Messaging (UM) solutions to thousands of customers globally since 1993 has led us to develop this short list of critical considerations when evaluating unified messaging (UM) solutions and considering the pros and cons of the various unified messaging solution architectures. Ensuring that you understand these five considerations (5 C's) is critical to your successful unified messaging deployment.


Existing Federal and State regulations regarding the retention and storage of electronic information means that it is critical to pay close attention to corporate compliance issues when considering the various unified messaging solution architectures.

AVST's Recommendation: Consult with your corporate compliance officer or legal counsel to ensure you pick the unified messaging architecture that best meets your organization's compliance requirements.


Preventing the external distribution of confidential corporate voice, e-mail and fax messages is, in many cases, as critical a consideration as compliance when evaluating unified messaging solutions.

AVST's Recommendation: Thoroughly understand your organization's requirements for protecting the confidentiality of corporate data to ensure you select the correct unified messaging architecture for your business.


Selecting a unified messaging solution that has the architectural flexibility to future proof your investment is another critical consideration. AVST uniquely offers four different architectural options in its Unified Messaging solution to ensure your organization has the maximum deployment flexibility today and, just as importantly, the ability to change the configuration of your unified messaging solution in the future based upon the evolving needs of your organization.

AVST's Recommendation: Attend an AVST webinar on Unified Messaging to ensure that you fully understand the implications of deploying each different unified messaging architecture.


Understanding the capabilities of each Unified Messaging solution you are evaluating is another critical consideration. What are the features and flexibility of the solution? Does it meet the requirements of your users that will be accessing the solution via the desktop, web, phone and/or mobile device? Can you deploy different feature sets for different users?

AVST's Recommendation: Click here for the Unified Messaging checklist to ensure that the Unified Messaging solutions you are evaluating have the features and flexibility your organization demands.


Understanding the total cost of ownership (TCO) for each Unified Messaging solution you are evaluating is another key consideration. Some questions to consider (and quantify) are:

  • Do I have to buy licenses for all employees in my organization?
  • How much will it cost me to add additional users in the future?
  • How much is the annual maintenance?
  • What additional hardware and software is required to deploy?
  • Do I need to upgrade or replace my groupware solution to get unified messaging?
  • Will the unified messaging solution integrate with my existing and future telephony infrastructure?
  • How much additional cost is involved if I decide to switch groupware solutions in the future?
  • How much will it cost to implement the unified messaging solution?

AVST's Recommendation: Develop a clear set of pricing, configuration and support guidelines and apply it to each unified messaging solution you are evaluating. Consider a five year TCO timeframe to ensure that you have the whole picture.