The EMU feature is used by people who travel to various locations within a company’s enterprise. The number of visited telephones activated to use EMU and the subsequent traffic the EMU users generate, must be taken into consideration when designing for EMU. EMU can affect both the signaling links used for transporting the QSIG messages and the bearer network used for voice traffic. Additional trunking between the Avaya servers in the network may be required to accommodate the additional traffic. The number of additional trunks can be determined by looking at the busy hour call rate for the roaming users and the blocking rate that is supported or required.