Panasonic KX-TDA0480 Installation Manual page 37

be assigned for both priorities.
When the KX-TDA0480 attempts to establish a connection with another VoIP gateway, the
gateway goes through a capabilities exchange and negotiates the CODEC to be used.
The KX-TDA0480 will try to use the High Priority Codec first. If the remote gateway does not
support the High Priority Codec, the Low Priority Codec is offered.
Use the Codec Information field to record the voice transmission Codec(s) to be used by all
ports on the unit. Also specify the Codec priority when two Codecs are used. G723.1 is the
default value for H.323 networks. G.729A can also be selected. The Efficiency to Quality
settings will vary based on the Codec selected.
In the sample, G.729A is the only Codec configured for use.
Efficiency to Quality (VOICECOND)
The ratio of Payload to Bandwidth for each Codec can be adjusted. The default values are
shown in the following table.
Codec
G.729A
G.723.1 (5.3)
G.723.1 (6.3)
The bytes and bandwidth values are inversely related in a predetermined ratio. In the
Maintenance Console Software, the values are adjusted using a slide-bar control that maintains
the correct ratio.
In the sample, Efficiency is recorded as the default value, 80 bytes/12.0 Kbps.
Network
Use the Network section of the worksheet to record parameters used in checking network
connectivity between the KX-TDA0480 and the immediate Ethernet switch or router to which
the unit is connected.
To perform checks, the KX-TDA0480 transmits ICMP error checking packets on a defined
error checking timing cycle. If no reply is detected, the link between the unit and Ethernet
switch is broken.
This feature's information is typically used in cases where the KX-TDA0480 are working in
groups associated with a PBX. In this case, failed links can be bypassed as calls are rerouted
through active links.
Installation Manual
Codec Default Parameters
Payload
80 bytes
160 bytes
192 bytes
Bandwidth
12K
7.5K
8.46K
Planning
37