Cisco Signaling Interface H.323 User Manual page 68

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.
The g726-cisco method avoids impaired or delayed processing because it advertises the data rate in the
Note
TCS messaging.
Refer to the Cisco H.323 Signaling Interface User Guide for information about Cisco HSI MML
commands.
Table 3-18
G.726 configuration.
Table 3-18 Configuring G.726
G.726 Parameter
Configuring the Payload Type for the MGCP
sys_config_static, UseG726StaticPayload
Configuring Cisco HSI g726-cisco
H245, caps.table[i].audio.g726-cisco
Cisco H.323 Signaling Interface User Guide
3-28
presents examples of configuration commands that may be required to implement a particular
Example Value
"enabled",
"true",
""
If this parameter is
Note
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.
"G726r16",
"G726r24",
"G726r32",
"G726r40"
These string values
Note
are case-sensitive,
and must be entered
exactly as displayed
in the commands in
this table.
Chapter 3
Configuration Example
prov-add:name=sys_config_static,
UseG726StaticPayload="enabled"
prov-ed:name=sys_config_static,
UseG726StaticPayload=""
prov-add:name=h245,
caps.table[5].audio.g726-cisco="G726r16"
prov-add:name=h245,
caps.table[6].audio.g726-cisco="G726r24"
Provisioning the Cisco HSI
OL-4806-01 Rev. A14