Isdn Q921-Permanent - H3C MSR810 Command Reference Manual

NOTE:
The device provides full support for DSS1. For any other variants of ISDN, the device only provides
the basic call functionality.
Examples
# Set the ISDN switch type to ETSI on BRI 2/4/0.
<Sysname> system-view
[Sysname] interface bri 2/4/0
[Sysname-Bri2/4/0] isdn protocol-type etsi
# Set the ISDN switch type to 5ESS on ISDN PRI interface Serial 2/3/0:23.
<Sysname> system-view
[Sysname] interface serial 2/3/0:23
[Sysname-Serial2/3/0:23] isdn protocol-type 5ess
Related commands
isdn protocol-mode

isdn q921-permanent

Use isdn q921-permanent to enable permanent Q.921 link connectivity on a BRI interface.
Use undo isdn q921-permanent to disable permanent Q.921 link connectivity on a BRI interface.
Syntax
isdn q921-permanent
undo isdn q921-permanent
Default
Permanent Q.921 link connectivity is disabled on ISDN BRI interfaces.
Views
ISDN BRI interface view
Predefined user roles
network-admin
Usage guidelines
You can enable permanent Q.921 link connectivity only on user-side ISDN BRI interfaces.
When this feature is enabled, the ISDN BRI interface establishes and maintains permanent data link
connections automatically, regardless of whether or not a c all is present. If the isdn two-tei
command is also configured, the ISDN BRI interface establishes and maintains two permanent data
link connections.
When this feature is disabled, the ISDN BRI interface transits to the multiframe established state only
when a call is present. In multiframe established state, the interface disconnects the Q.921 link if no
Q.931 call is present when the T325 timer expires.
To ensure successful call setup when ISDN NI is used, you must enable permanent Q.921 link
connectivity.
Examples
# Enable permanent Q.921 link connectivity on BRI 2/4/0.
<Sysname> system-view
[Sysname] interface bri 2/4/0
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