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58 Chapter 8 IP telephony
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M1-IPT
The Meridian 1 Internet Telephony Path (M1-IPT) allows Meridian 1 systems to communicate
with the BCM via H.323 trunks. Telephones on the M1, such as Meridian telephone A, can initiate
and receive calls with 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 the
BCMs through ISDN PRI SL-1 lines, which provide the same MCDN capability that you can
achieve through the H.323 VoIP trunks with MCDN active.
A BCM connected to an M1-IPT using the MCDN protocol can provide access to a central voice
mail and call attendant systems, which can streamline multi-office telephony administration.
Telephones
The BCM can communicate using digital telephones (Model 7000, 7100, 7208, 7316,
7316E/7316E+KIMs, 7406 (cordless telephone), Norstar M-series telephones, ISDN telephones,
analog telephones, and IP telephones and applications. With this much flexibility, the BCM can
provide the type of service you require to be most productive in your business.
While analog and digital telephones cannot be connected to the BCM system with an IP
connection, they can make and receive calls to and from other systems through VoIP trunks. Calls
received through the VoIP trunks to system telephones are received through the integrated
interface (LAN card) or the IP network and are translated within the BCM to voice channels.
The IP telephones connect to the BCM across an IP network through either a LAN or a WAN.
From the BCM connection, they can then use standard lines or VoIP trunks to communicate to
other telephones on other public or private networks. The BCM also supports SIP, H.323
(version 4) and H.323 third-party devices through this type of connection.
Gatekeepers on the network
A 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 part
of the network to which your BCM system is attached, but gatekeepers can be useful on networks
with a large number of devices. Referring to
Figure 11 , for example: Digital telephone A wants to
call IP telephone B, which is attached to BCM B, over a network that is under the control of a
gatekeeper. Digital telephone A sends a request to the gatekeeper. The gatekeeper, depending on
how it is programmed, provides Digital telephone A with the information it needs to contact BCM
B over the network. BCM B then passes the call to IP telephone B.
The BCM does not contain a gatekeeper application. If you want to put a gatekeeper on your
network, it must be put on a separate gatekeeper server. The BCM is compatible with CS1000
(CSE1K) gatekeepers.
Warning:
Meridian 1 IPT does not support the RadVision gatekeeper.