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5-22 STRATA CS ADMINISTRATOR MANUAL
BETA DOCUMENT - PRELIMINARY & CONFIDENTIAL
n Send inbound calls to. Select the auto attendant, user or IVR
Plug-in that answers all inbound voice calls on the trunks in this span.
3. Click the Trunks tab to specify how trunks in this span are used:
n Accept inbound calls. If checked, the trunks are used for inbound
calls.
n Allow outbound calls. If checked, the trunks are used for outbound
calls.
4. Click the Codecs tab to view the default codecs used by this span for all
inbound calls and as dialing service defaults for outbound calls. If you
must change Strata CS’s default codec list, see the next section,
“Modifying Strata CS IP codecs.”
Note:
You can override the default span codecs when you set up a
dialing service that allocates trunks in this span (see “Codecs tab” on
page 8-21).
5. Click OK to add the span to your configuration.
Modifying Strata CS IP codecs
A codec is a protocol used to compress and decompress voice signals for
transmission over an IP network. When an IP call is established between two
devices, the devices automatically choose which codec to use. This choice is
based on whether the codec is available to both devices and how highly the codec
is preferred by both. This tab lets you make codecs available to your device, and
arrange them in order of preference, with the topmost codec being the most
preferred. For example, you may prefer one codec over another for bandwidth
reasons.
Important:
When you are connecting two Strata CS Servers over an IP Gateway
connection, the Servers must use the same codec lists, otherwise audio failure can
occur during calls. See “Connecting two Servers using IP Gateways” on page 13-7
for more information about IP Gateway connections.
The codecs you can make available are listed below. See the Known Issues in the
Administrator online Help for up-to-date information about the availability of
codecs.
n G.729a. Best for Strata CS-to-Strata CS connections. Offers a good
balance between sound quality and bandwidth. (8.8 kbs.)
n G.711 a-law, G.711 µ-law. Supported by all H.323 gateways and
terminals, but high bandwidth. (64 kbs.)
n G.723.1. Best for NetMeeting and other H.323 terminals. (5.3 kbs. or 6.3
kbs.)
n MSGSM. (13.0 kbs.)