Installation guide

Configuring bandwidth management zones 6-29
Chapter 6: IP Telephony Configuration
Wave Global Administrator Guide
Zone configuration recommendations
Keep in mind the following rules while configuring zones:
• A zone is defined by a set of IP address ranges. Any number of Signaling Control Points
(SCPs) and IP phones can exist in the same zone. Any SCP or IP phone whose IP address
is not explicitly configured as part of a zone is automatically included in the Default
Zone. All TDM devices, including voicemail ports and conference bridges reside in the
Home Zone.
• For devices in two different zones to be able to communicate, it is necessary that a
common codec is configured in each of the zones’ inter-zone preference lists. In the
absence of a common codec, calls between the two zones will not be allowed.
• Calls between zones always engage the inter-zone rules for both zones.
• When an IP device is involved in a conference, the inter-zone rules between the IP
device’s zone and the Home Zone come into play. If there are no common codecs, or
there is insufficient bandwidth, then the device is not permitted to participate in the
conference.
Codec configuration guidelines
With these rules listed above in mind, Vertical recommends that you follow these configuration
guidelines:
• Configure all zones to use the G.711U codec only (either u-law, a-law, or both), and
remove the G.729 codec from the inter-zone codec preference lists. If G.729 or G.711A is
specifically required in your implementation, use then that codec only and leave all other
codecs off the preference lists.
• If there is a zone requiring G.729 exclusively, then G.711 should be left off of its
inter-zone preference list. In this situation, it is essential that all remaining zones include
G.729 on their inter-zone codec preference lists. Devices in zones configured to use G.711
exclusively will not be able to call devices in zones configured to use G.729 exclusively.
Release 2.0
September 2010