/mcp• Intrasite Networking: If your organization has users that are more than what a single Unity Connection server or cluster pair can support, you can join two or more Unity Connection servers or clusters (up to a maximum of ten) to form a well-connected network, referred to as a Unity Connection site. The servers that are joined to the site are referred to as Locations. (When a Unity Connection cluster is configured, the cluster counts as one location in the site.) Each location is said to be linked to every other location in the site via an intrasite link. The Unity Connection site concept was known as a digital network in Unity Connection 7.x. You can join Unity Connection 7.x locations, 8.x locations, 9.x locations, 10.x locations, 11.x, and 12.x locations in the same Unity Connection site, as long as you do not link the site to any other site. Users, system distribution lists, partitions, search spaces, and Unity Connection locations are replicated between sites. • Intersite Networking: An intersite link can be used to connect either one Unity Connection site to another Unity Connection site or to inter-network Unity Connection with the Unity servers. Intersite link can be configured for 20 locations. For more information on legacy networking, see the Networking, on page 125 chapter. To support inter-networking between Cisco Unity and Unity Connection sites, all servers in the site must be running Unity Connection version 10.x or later. Note • HTTPS: With Unity Connection 10.0(1), a new concept of networking, HTTPS networking, has been introduced to connect different Unity Connection servers and clusters in a network. You should deploy a new network as an HTTPS network. You can connect maximum 25 Unity Connection locations in an HTTPS network. Within a network, each location uses HTTP or HTTPS to exchange directory information and SMTP to exchange voice messages with each other. For more information on HTTPS, see the Networking, on page 125 chapter. • SRSV: Cisco Unity Connection Survivable Remote Site Voicemail (Unity Connection SRSV) is a backup voicemail solution that works in conjunction with Cisco Unified Survivable Remote Site Telephony (SRST) for providing voicemail service to central and all remote locations during WAN outages. For more information on SRSV, see Complete Reference Guide for Cisco Unity Connection Survivable Remote Site Voicemail (SRSV) for Release 15, available at https://www.cisco.com/c/ en/us/td/docs/voice_ip_comm/connection/15/srsv/guide/b_15cucsrsvx.html. SRSV deployment is supported with Unity Connection 9.1.2 and later. Note Configuring Mailbox Storage and Email Account for Each User Unity Connection has an installed mailbox store. Unity Connection handles user properties, such as user mailbox accounts and voice messages by creating a directory configuration database. You need to configure your mailbox store as per your messaging needs. • Mailbox Store: Mailbox store is a repository that is used to store messages and Unity Connection directory information. A single mailbox store is created at the time of installation and is named as UnityMbxDb1. You can add additional message storage for better performance.For more information on message storage, see the Message Storage, on page 113 chapter. System Administration Guide 10 Introduction Configuring Mailbox Storage and Email Account for Each User