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Cisco IP Telephony Network Design Guide
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Chapter 4 Gateway Selection
Supplementary Services
If the primary Cisco CallManager becomes available at a later time, the VG200
can revert to the original Cisco CallManager. This fallback can either occur
immediately, after a configurable amount of time, or only when all connected
sessions have been released. This behavior is enabled through the following
VG200 global configuration commands:
ccm-manager redundant-host {hostname1 | ipaddress1} [hostname2 |
ipaddress2]
[no] call-manager redundancy switchback [immediate | graceful | delay
delay-time]
Supplementary Services
Supplementary services provide user functions such as hold, transfer, and
conferencing. These are considered fundamental requirements of any voice
installation. Any gateway evaluated for use in an Cisco AVVID network should
provide native support for supplementary services without the use of a software
media termination point (MTP).
Skinny Gateways
The Cisco Access Digital Trunk Gateway DT-24+ and DE-30+ products as well
as the Catalyst 6000 series gateways all provide full supplementary service
support. These gateways utilize the gateway-to-Cisco CallManager signaling
channel and Skinny Gateway Protocol to exchange call control parameters. For
more information, see the “Additional Information” section on page xvii.
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