Voice Enhancement Features for Cisco IOS Release 12.4(24)T
Prerequisites for 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
Prerequisites for Voice Enhancement Features for Cisco IOS
Release 12.4(24)T
The prerequisites defined in the following sections apply to the configuration of the Cisco VGD 1T3,
Cisco AS5350XM, and Cisco AS5400XM voice gateways:
• You must have Cisco IOS Release 12.4(24)T or a later release installed on the Cisco VGD 1T3,
Cisco AS5350XM, and Cisco AS5400XM voice gateways.
• To enable Secure Real-Time Transport Protocol (SRTP) on a Cisco VGD 1T3, Cisco AS5350XM,
or Cisco AS5400XM configured as a Media Gateway Control Protocol (MGCP) gateway, first
establish an IPsec connection between the Cisco Unified Communications Manager and the MGCP
gateway before using the MGCP SRTP package. Otherwise, media keys are sent in clear text and
your voice call is not secure.
Restrictions for Voice Enhancement Features for Cisco IOS
Release
12.4(24)T
• For the Private Line Automatic Ringdown (PLAR) Connection feature, only E&M immediate start
signaling configured on the T1 within the CT3 line is supported. This feature does not support
Foreign Exchanger Service (FXS) loop-start signaling.
• The Media Forking feature is not supported on the Cisco Unified Border Element, and SRTP is not
supported on the forked stream.
Information About Voice Enhancement Features for Cisco IOS
Release
12.4(24)T
To configure these enhancement features, you should understand the following:
• SIP Support for Media Forking, page 187
• Automatic Switch to G.Clear Codec when ISDN Bearer Capability IE Indicates 64K Unrestricted
Bearer, page 187
• Private Line Automatic Ringdown for Trading Turrets Connection, page 187
• Connection Trunk and Transparent CCS for Trading Turrets, page 188
• Modem Pass-through Using SIP re-invite, page 188
• Voice Port Bit Conditioning, page 190
• Voice Trunk Conditioning and Trunk Conditioning OOS, page 190
• Enhanced Multifrequency Signaling for Feature Group D (E911), page 190
• Call Progress Analysis, page 191
• T.38 Fax Relay Statistics, page 192
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