Configuring Isdn; Configuring Isdn Bri - 3Com MSR 50 Series Configuration Manual

422 C 22: ISDN C
HAPTER

Configuring ISDN

Configuring ISDN BRI

ONFIGURATION
(Nippon Telegraph and Telephone Corporation) in Japan, ETSI (European
Telecommunications Standards Institute) in Europe, NI (National ISDN), AT&T 5ESS,
and ANSI (American National Standard Institute) in North America. Besides the
default DSS1 ISDN protocol, the router supports the basic calling function of NTT,
ETSI, ATT, ANSI, NI, NI2, and Q.SIG protocols, but does not support the
supplementary functions or network-side functions of these protocols.
NI protocol used in North America is only applied to BRI interface. The ISDN
network uses SPID (Service Profile Identification) as the ID of different services, and
the switch provides the corresponding service to the terminal user according to the
SPID. Each B channel corresponds to a SPID. Only after having employed the SPID
to perform the SPID handshake interaction, can the user proceed with normal
calling and disconnection process. Therefore, after the Q.921 establishes link
successfully and before the Q.931 calling processing starts, the user needs to
obtain SPID to interact with the switch to perform the Layer 3 (Q.931)
initialization, then he can start normal calling and disconnect process., otherwise,
the calling will fail.
By far, there are three ways to obtain the SPID on one BRI interface over the ISDN
in North America.
Manually input the SPID consisting of 9 to 20 digits.
■
14-digit SPID (Generic SPID Format). The former 10 digits are input by the user,
■
and the latter 4 digits can only be "0101".
Allocate by SPCS (Stored Program Control Switching System) through
■
Automated SPID Selection Regulation.
The former two ways to obtain SPID are regarded as static configuration methods,
and the third one is taken as dynamic negotiation method. If the user does not
specify a SPID in static method, the system will adopt dynamic method by default.
Follow these steps to configure ISDN BRI:
To do...
Enter system view
Enter specified ISDN BRI
interface view
Configure the BRI interface to
operate in the point-to-point
mode
Set ISDN protocol type
Use the command...
system-view
interface interface-type
interface-number
isdn link-mode p2p
isdn protocol-type
protocol
Remarks
-
-
Optional
By default, a BRI interface
operates in the
point-to-multipoint mode, in
which a BRI interface operating
on the network side can have
multiple end devices attached to
it.
Optional
The ISDN protocol on the BRI
interface is DSS1 protocol by
default.