Configuring Voice over IP
Configuring Basic VoIP
97
Cisco VGD 1T3 Voice Gateway Software Configuration Guide
Configuring Signaling on Voice Ports
The Cisco VGD 1T3 voice gateways process and manage digital voice calls on the universal port or voice
feature card. They support voice configuration on channelized T1 and T3 trunk interfaces.
Your VGD 1T3 voice gateway supports ISDN PRI, and T1 CAS digital signaling. Configure your voice
ports according to signaling type. Set parameters as needed for input gain, output attenuation, echo
cancellation, various timeouts, and translation rules. Defaults are generally adequate, but may need to
be tweaked for some networks.
Note
For ISDN configurations, voice ports (with serial interfaces acting as D channels) are created
automatically when you configure an ISDN PRI group. Before configuring your voice ports, configure
both B and D channels as described in the chapter
“Basic Configuration Using the Command-Line
Interface.”
Tip
For more information, see the following online references:
•
Voice over IP for the Cisco AS5300, available online at
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120t/120t3/voip5300/
•
Voice Over IP for the Cisco 3600 Series Commands, available online at
http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113t/113t_1/voip/
commands.htm
ISDN PRI Signaling
Signaling for ISDN PRI VoIP is handled by ISDN PRI group configuration. If you have ISDN PRI voice
ports, be sure to complete these tasks:
•
“Configuring ISDN PRI”in the chapter
“Basic Configuration Using the Command-Line Interface”
•
“Configuring the D Channels for ISDN Signaling” in the chapter
“Basic Configuration Using the
Command-Line Interface”
•
“Configuring ISDN NFAS on Channelized T1 PRI Groups” in the chapter
“Continuing
Configuration Using the Command-Line Interface”
Ensure that multiframes are established on the serial interfaces (acting as the D channel). Then set
parameters as needed for input gain, output attenuation, echo cancellation, various timeouts, and
translation rules.
T1 CAS Signaling
Channel-associated signaling (CAS) occurs in-band within the data channel, rather than on a separate
signaling channel as is the case (on the D channel) with ISDN PRI. For T1 CAS, specify parameters such
as frame type and line code.
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