This option is also effective if you have teams or departments that are spread over wide geographic areas, where the savings in long-distance charges can be significant. The incremental option is recommended if you have clearly defined user groups that have communication requirements in common and that lend themselves to centralized management. Additional workgroups can be migrated to Enterprise Voice, as needed. Workgroups whose communication needs are best served by Microsoft Unified Communications are moved to Enterprise Voice, while other users remain on the existing PBX. This incremental deployment strategy provides one way to introduce IP telephony into your enterprise through controlled pilot programs. In incremental deployment, Skype for Business Server is the sole telephony solution for individual teams or departments, while the rest of the users in an organization continue to use a PBX. VoIP-only deployment: this option assumes that you are considering deploying Enterprise Voice at a site that does not have a traditional telephony infrastructure. Incremental deployment: This option assumes that you have an existing private branch exchange (PBX) infrastructure and you intend to introduce Enterprise Voice incrementally to smaller groups or teams within your organization. This section describes the following deployments in detail: If your organization uses one of the deployments described in this section, you can use Skype for Business Server as the sole telephony solution for part or all of an organization. Direct SIP deployment options Skype for Business Server Stand-Alone The only difference is that you connect SIP trunks to an external entity, such as an ITSP gateway, and you connect direct SIP connections to an internal entity within your local network, such as an IP-PBX or a public switched telephone network (PSTN) gateway. In both cases, you implement the connection by using the external interface of a Mediation Server. To implement a direct SIP connection, you follow essentially the same deployment steps as you would to implement a SIP trunk. You can use direct SIP connections to connect Skype for Business Server to either of the following: Direct SIP connections are supported between Skype for Business Server and both PSTN gateways and IP-PBX in Enterprise Voice.
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