Voice Enhancement Features for Cisco IOS Release 12.4(24)T
Information About Voice Enhancement Features for Cisco IOS Release 12.4(24)T
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Cisco AS5350XM and Cisco AS5400XM Universal Gateways Software Configuration Guide
This command sets the maximum time that the CPA algorithm waits for the answering machine
terminating tone after the answering machine is detected. The default value is 15000 ms.
–
cpa timing timeout 1 ... 60000
This command sets the maximum time that the CPA algorithm should wait before timing out if
it doesn’t detect a voice signal. The default value is 3000 ms.
–
cpa timing valid-speech 1 ... 60000
This command sets the minimum voice duration for the CPA algorithm to consider it a valid
speech signal. The default value is 112
ms.
For more information about the use of these commands, refer to the Cisco IOS Voice Command
Reference.
T.38 Fax Relay Statistics
The Internet Engineering Task Force (IETF) RADIUS standards (RFCs 2865 and 2866) specify that you
can use attribute 26 for communicating vendor-specific information between a network access server
(NAS with RADIUS client) and an authentication/accounting server (RADIUS server). RADIUS
attribute 26 is the vendor-specific attribute (VSA). The vendor ID for Cisco VSAs is 9.
Beginning with Cisco IOS Release 12.4(24)T, T.38 fax relay statistics are available for RADIUS
accounting with new vendor-specific attributes added to the call detail record (CDR) via the
“accounting-stop” RADIUS message. The fax relay VSAs can be individually added when you use an
accounting template. If no template is used, all fax relay VSAs are sent when gateway accounting is
enabled. The proposed VSAs are presented to the AAA server as formatted text strings. Prior to Cisco
IOS Release 12.4(24)T, these attributes were available for NextPort DSPs. Beginning with Cisco IOS
Release 12.4(24)T, these attributes are added for HPI-based 5510 DSPs.
The following T.38 statistics require VSAs to be added:
• Maximum jitter buffer depth
• Number of jitter buffer overflow errors
• Number of transmitted fax packets
• Number of received fax packets
• Initial high-speed modulation
• Most recent high-speed modulation
• Number of fax pages (sum of transmitted and received pages)
• Nonstandard frame (NSF) country code
• Fax success indicator (derived value in Cisco IOS software)
The statistics can be displayed using the command-line interface by entering the show call [active |
history] [fax | voice] command.
The statistics are also available for authentication, authorization, and accounting (AAA) by adding VSAs
to the RADIUS “accounting-stop” message when gateway accounting is enabled. Gateway accounting
is enabled with the gw-accounting command in global configuration mode. The fax relay VSAs can be
individually enabled by using an accounting template. If no template is used, all fax relay VSAs will be
sent when gateway accounting is enabled.
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