Software requirements 47Capacity Each CS 1000 main office can support up to 255 branch offices. EachBranch Office supports up to 400 IP Phone users. However, since all IPPhones register with the main office, the governing factor is the maximumnumber of IP Phones that can be supported at the main office. Thismeans the total number of IP Phones in all offices can be no greaterthan the capacity of the main office, as determined using CommunicationServer 1000E Planning and Engineering (NN43041-220), CommunicationServer 1000M and Meridian 1 Large System Planning and Engineering(NN43021-220), or Communication Server 1000M and Meridian 1 SmallSystem Planning and Engineering (NN43011-220).The configuration of an MG 1000B platform depends on:• the number of line and trunk cards being provisioned• the number of Media Cards required to provide a sufficient number ofDSP channelsMedia Card DSP capacityThe number of DSP ports to provision depends on the trunk-to-telephoneratio. A rule-of-thumb is to have the number of ports greater than orequal to the number of trunks configured. See Communication Server1000S: Planning and Engineering (NN43031-220) (or CommunicationServer 1000M and Meridian 1 Small System Planning and Engineering(NN43011-220) for converted Small Systems) for more information.If digital telephones and analog (500/2500-type) telephones are equipped atthe Branch Office, additional DSP ports are needed for digital-to-IP Phoneand analog-to-IP Phone connections. The number of additional DSP portsmust be equal to or greater than the expected number of simultaneousconnections of these types. The user can engineer fewer DSP portsdepending on their desired blocking ratio.Software requirementsThis section describes the relative software versions required in themain office and Branch Office locations. The actual software packagingrequirements are given in "Main office requirements" (page 192) and"Branch Office requirements" (page 193).Main and Branch Office running the same releaseNormally, the main office and associated Branch Office run the samesoftware release.However, a Branch Office location can be running an earlier softwarerelease than that running at the main office. This situation is discussed inthe next section.Nortel Communication Server 1000Branch Office Installation and CommissioningNN43001-314 01.02 StandardRelease 5.0 20 June 2007Copyright © 2007, Nortel Networks.
