Specifications
Wizard Nur für den internen Gebrauch
A31003-H3580-M103-2-76A9, 01-2009
5-8 HiPath 3000/5000 V8 - HG 1500 V8, Administrator Documentation
hg-05.fm
Initial Setup
5.1.3 Codec Parameters
Background information:
See Section 9.2, "Bandwidth Requirements in LAN/WAN Environments"
Codec table
In the "Codec" table you can edit the following parameters for the G.711-A-law, G.711-µ-law,
G.723, G.729A, and G.729AB protocols:
● Priority: This field contains the priority for using the codec. The priority can be set from 1
(high) to 5 (low). Assign different priorities to the codecs. In the default configuration, G.711
A-law has priority 3, G.711 µ-law has priority 4, G.723 has priority 5, G.729A has priority
2, and G.729AB has priority 1.
● Voice Activity Detection (VAD) This field defines whether or not Voice Activity Detection
(VAD) should be used for the relevant codec.
● Frame Size: You can set the sampling rate in this field. The adjustable values depend on
the codecs.
T.38 Fax
● T. 3 8 Fa x : This field defines whether or not the T.38 Fax protocol is to be used.
● Use FillBitRemoval: This field defines whether or not fill bits should be deleted on sending
and restored on receiving when using the T.38 Fax protocol. This makes it possible to save
bandwidth.
● Max. UDP Datagram Size for T.38 Fax (bytes): Enter the maximum size of a T.38 UDP da-
tagram in bytes.
● Error Correction Used for T.38 Fax (UDP): This field defines which method is to be used
for error correction. The possible choices are "t38UDPRedundancy“ and "t38UDPFEC“, re-
spectively.
>
Codec G729 is identical to codec G729A, and codec G729B is identical to codec
G729AB (no difference in terms of payload). Codecs G729 and G729B are therefore
deactivated by default.
From the perspective of H323 signaling, codecs G729 and G729A are different to
codecs G729B and G729AB.
Some non-HiPath H323 endpoints (Cisco GK) use the codec G729 or G729B for
H323 signaling. In this case, the codecs G729 and G729B must also be used in the
HG 1500 V8.
Codecs G729 and G729B can remain inactive in a HiPath-only network.