Toshiba Strata CTX Programming Manual page 184

IP Telephone Programming
250 Station IP Data Assignment
F
IELD
08 Audio Codec
09 Display Software
Version Number of IPT
8-8
D
ESCRIPTION
IP telephones have two built-in codecs. Select the audio codec that should
be used in this IPT.
CAUTION! If installing IP Telephones remotely using Cable and
DSL ISP providers, Toshiba recommends setting up the
telephone to use G729A codec because of upstream
bandwidth restrictions imposed by the provider. Even if
the provider advertises an upstream rate is 128kbs, this
bandwidth can still be less depending on traffic
conditions.
This option is available only on ground and loop, analog or T1 circuits. It should not
be enabled for Tie, DID, ISDN and QSIG lines
Possible values: G711 (default), G729A
Notes
The G711codec - provides the highest voice quality but uses the most
•
network bandwidth.
The G729A codec - provides less voice quality but uses the least
•
amount of network bandwidth.
High traffic or low speed networks may require the IP Telephones to use
•
G729A.
Example
If installing remote IP telephones connected to Cable or DSL lines, the
upstream rate is usually restricted and may not provide a consistent
upstream bandwidth (advertised as 128kbs but is normally less because of
traffic) so the G729a codec would probable be the best choice for this
situation.
The Voice Packet Table 'Prg250-07' and the VP Table's Voice packet
interval 'Prg150-01' must be set properly for the codec assigned.
This is read-only. If any problem occurs, it is useful to analyze the problem
with this version. The sample of software version is "DIP11NA." DIP1
represents the IPT model. 1NA represents software version of IPT. "1N"
represents the version of updatable software and "A" means the version of
not-updatable software (BootROM).
Strata CTX Programming - Part 2: CTX WinAdmin Programming 04/03