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2718 CHAPTER 179: VOFR CONFIGURATION COMMANDS
sub-channel status. If the keepalive keyword is configured, network congestion is
considered occurring when one end fails to receive any KeepAlive message within
a period of time. In this case, the active call control sub-channel will be
deactivated, and no voice call can be set up any longer. If the keepalive keyword
is not configured, the control sub-channel status is synchronized with the PVC
status.
huawei-compatible: Adopts the Huawei-compatible mode.
motorola-compatible: Adopts the Motorola-compatible mode for compatibility
with VoFR of Motorola routers.
nonstandard-compatible: Adopts the nonstandard-compatible mode for
compatibility with VoFR of Cisco routers.
dce: Specifies the virtual circuit to serve as a DCE in compliance with Annex G.
dte: Specifies the virtual circuit to serve as a DTE in compliance with Annex G.
Description Use the
vofr command to configure a VoFR operation mode for a DLCI.
Use the undo vofr command to restore the default.
By default, no VoFR operation mode is configured.
If the VoFR operation mode is set to Motorola-compatible and the call mode is set
to static (FRF.11 trunk mode), a call failure will occur.
In the Motorola-compatible mode, one DLCI can work in either the dynamic mode
or the FRF.11 trunk mode. In the Huawei-compatible or Motorola-compatible
mode, the T1.167 Annex G protocol is adopted. In this case, different ANNEX
G-compliant control block types must be configured at both ends: one to DTE and
the other to DCE.
Related command: call-mode.
Example # Set the call control protocol on DLCI 1000 to nonstandard-compatible, call
control sub-channel number (ccid) to 4, and data sub-channel (dcid) to 5, and
enable the regular sending of KeepAlive messages.
<Sysname> system-view
[Sysname] interface serial 1/0
[Sysname-Serial1/0] link-protocol fr ietf
[Sysname-Serial1/0] fr dlci 110
[Sysname-fr-dlci-Serial1/0-100] vofr nonstandard-compatible signal-c
hannel 4 data-channel 5 keepalive
# Set the call control protocol on DLCI 200 to Huawei-compatible (DTE).
<Sysname> system-view
[Sysname] interface serial 1/0
[Sysname-Serial1/0] link-protocol fr ietf
[Sysname-Serial1/0] fr dlci 200
[Sysname-fr-dlci-Serial1/0-100] vofr huawei-compatible dte