• Inbound and outbound PSTN calls
  
  
• Enterprise calls between users at both the same site and between two different sites
  
  
• Basic call handling, including call hold, retrieval, and transfer
  
  
• Two-party instant messaging
  
  
• Call forwarding, simultaneous ringing of endpoints, call delegation, and team call services, but only if the delegator and delegate (for example, a boss and the boss’s administrator), or all team members, are configured at the same site
  
  
• Call detail records (CDRs)
  
  
• PSTN dial-in conferencing with Conferencing Auto-Attendant
  
  
• Voice mail capabilities, if you configure voice mail rerouting settings. (For details, see Branch-Site Resiliency Requirements.)
  
  
• User authentication and authorization
  
  

The following features will be available only if your resiliency solution is a full-scale Microsoft Lync Server 2010 deployment at the branch site:

• IM, web and A/V conferencing
  
  
• Presence and DND-based routing
  
  
• Updating call forwarding settings
  
  
• Response Group service and Call Park
  
  
• Provisioning new phones and clients, but only if Active Directory Domain Services (AD DS) is present at the branch site.
  
  
• Enhanced 9-1-1 (E9-1-1)
  
  If E9-1-1 is deployed, and the SIP trunk at the central site is not available because the WAN link is down, then the Survivable Branch Appliance will route E9-1-1 calls to the local branch gateway. To enable this feature, branch-site users’ voice policies should route calls to the local gateway in the event of WAN failure.