For example: presence awareness, mobility, CRM integration, remote workers, instant messaging, voicemail to email, faxing, contact center functionality, paging, etc.
This is important as most vendors do not support all functionality on all device types. Is your organization 100% vested in Windows PCs, smartphones, and tablets and relies on Microsoft Dynamics for a CRM? Then Lync is a good place to start. However, if your organization (like most) uses a mixture of Mac and PC desktops, a host of Android tablets and iPads, a variety of installed apps and web based cloud apps, plus a menagerie of smartphones, then a company like Teo is a better choice because of the wide range of devices and operating systems that we support.
Not sure? Or think your needs may change in the foreseeable future? Then Teo should be a top consideration, as we are the only company that can support all deployment types and allow future conversion between them quickly and painlessly.
Invite a selection of vendors to present their solutions to provide you a better sense of what they offer and are capable of delivering.