Nortel BCM50 Installation And Configuration Manual

Also see for BCM50: Configuration guide Installation and maintenance guide Keycode Installation Guide Integration guide Installation and configuration guide

Contents

20 Chapter 2 IP telephone overviewN0027269 01N0027269 01M1-IPTThe Meridian 1 Internet Telephony Path (M1-IPT) allows Meridian 1 systems to communicatewith the BCM50 through H.323 trunks. Telephones on the M1, such as Meridian set A, can initiatecalls to and receive calls from the other telephones on the system across IP networks.To provide fallback at times when IP traffic cannot pass, you can also connect the Meridian to theBCM50s through ISDN PRI SL-1 lines, which provide the same MCDN capability that you canachieve through the H.323 VoIP trunks with MCDN active.A BCM50 connected to an M1-IPT using the MCDN protocol can provide access to a centralvoicemail and call attendant system, which can streamline multi-office telephony administration.TelephonesThe BCM50 can communicate using digital telephones, Norstar M-series telephones, ISDNtelephones, analog telephones, and IP telephones (20XX).While analog and digital telephones cannot be connected to the BCM50 system with an IPconnection, they can make and receive calls to and from other systems through VoIP trunks. Callsreceived through the VoIP trunks to system telephones are received through the LAN or WAN andare translated within the BCM50 to voice channels.The IP telephones connect to the BCM50 across an IP network through either a LAN or a WAN.From the BCM50 connection, they can then use standard lines or VoIP trunks to communicate toother telephones on other public or private networks. The BCM50 also supports H.323 (version 4)and H.323 third-party devices through this type of connection.Gatekeepers on the networkA gatekeeper tracks IP addresses of specified devices, and provides routing and (optionally)authorization for making and accepting calls for these devices. A gatekeeper is not required as partof the network to which your BCM50 system is attached, but gatekeepers can be useful onnetworks with a large number of devices. Referring to Figure 1 on page 19, for example: Digitaltelephone A wants to call IP telephone B, which is attached to BCM50 B, over a network that isunder the control of a gatekeeper. Digital telephone A sends a request to the gatekeeper. Thegatekeeper, depending on how it is programmed, provides Digital telephone A with theinformation it needs to contact BCM50 B over the network. BCM50 B then passes the call to IPtelephone B.The BCM50 does not contain a gatekeeper application. If you want to install a gatekeeper on yournetwork, it must be put on a separate gatekeeper server. The BCM50 is compatible with CSE 1000(CSE1K), and NetCentrex gatekeepers.IP networkIn the network shown in Figure 1 on page 19, several LANs and a WAN are shown. Whenplanning your network, be sure to consider all requirements for a data network. Ask your networkadministrator how to set up your network for the BCM50.