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Cisco H.323 Signaling Interface User Guide
OL-4806-01 Rev. A14
Chapter 3 Provisioning the Cisco HSI
HSI Feature Configuration
If a non-preferred G.726 data rate is selected over a higher-preference codec, the HSI will continue with
the call using the non-preferred data rate. This is preferable to the alternative (aborting the media stream,
invoking an empty capability exchange followed by a re-negotiation of codecs and new OLC messaging).
The alternative causes call processing delay and overhead associated with switching media streams.
Note The g726-cisco method avoids impaired or delayed processing because it advertises the data rate in the
TCS messaging.
Refer to the Cisco H.323 Signaling Interface User Guide for information about Cisco HSI MML
commands.
Table 3-18 presents examples of configuration commands that may be required to implement a particular
G.726 configuration.
Table 3-18 Configuring G.726
G.726 Parameter Example Value Configuration Example
Configuring the Payload Type for the MGCP
sys_config_static, UseG726StaticPayload “enabled”,
“true”,
“”
Note If this parameter is
set to any text value,
the Cisco HSI uses
static payload value
'2' to represent
G.726 32kbit/sec to
the MGCP gateway.
If the parameter is
deleted or is set to an
empty string (“”),
the HSI uses the
default, dynamic-
payload behavior.
prov-add:name=sys_config_static,
UseG726StaticPayload="enabled"
prov-ed:name=sys_config_static,
UseG726StaticPayload=""
Configuring Cisco HSI g726-cisco
H245, caps.table[i].audio.g726-cisco “G726r16”,
“G726r24”,
“G726r32”,
“G726r40”
Note These string values
are case-sensitive,
and must be entered
exactly as displayed
in the commands in
this table.
prov-add:name=h245,
caps.table[5].audio.g726-cisco="G726r16"
prov-add:name=h245,
caps.table[6].audio.g726-cisco="G726r24"