Estimating Trunk Channel Requirements for VoIP Gateways in Unified Communications Deployments
Unified Communications (UC) solutions typically use VoIP to deliver phone calls and are connected to the PSTN either through an IP PBX or via VoIP gateways, such as a Dialogic Media Gateway (DMG Gateway), which can provide easy and cost-effective connectivity to an organization's TDM-based PBX or directly to the PSTN. Estimating the number of trunk channels that must be supported through VoIP gateways can be a challenge. This white paper provides information that can help survey users and characterize call volume, assign a ratio of users to trunk channels, summarize an organization's needs, and localize requirements. Some other considerations are discussed, including the effect of UC conference usage, remote worker requirements, and why some organizations may need more or less resources than average usage estimates.