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This document describes support for Feature Group D on Cisco platforms and includes the following sections:
This feature extends support for Feature Group D signaling on Cisco platforms. Feature Group D service is a trunk-side connection that enables telephone customers to choose their long distance network and use the same number of digits no matter which carrier they use. Routers interface with interexchange carriers using Feature Group D to support voice traffic in the carrier environment.
Cisco platforms use Feature Group D to provide voice functionality in the carrier environment. Feature Group D is a trunk-side local access transport area (LATA) access that supplies the following features:
This feature is supported on the following platforms:
None.
To configure your digital T1/E1 packet voice trunk network module to use Feature Group D, you must perform the following tasks:
The following steps specify codec settings for voice cards and set up T1 controllers for Feature Group D.
| Command | Purpose | |||
|---|---|---|---|---|
Step 1 | Router# configure terminal | Enter global configuration mode. | ||
Step 2 | Router(config)# voice-card slot | Enter voice card interface configuration mode and specify the slot location by using a value from 0 through 5, depending upon your router. | ||
Step 3 | Router(config)# controller T1 slot/port | Enter controller configuration mode for the T1 controller at the specified slot/port location. Valid values for slot and port are 0 and 1. | ||
Step 4 | Router(config-controller)# | Set the framing according to your service provider's instructions. Choose Extended Superframe (ESF) format or Superframe (SF) format. | ||
Step 5 | Router(config-controller)# | Set the line encoding according to your service provider's instructions. Bipolar-8 zero substitution (B8ZS) encodes a sequence of eight zeros in a unique binary sequence to detect line coding violations. Alternate mark inversion (AMI) represents zeros using a 01 during each bit cell, and ones are represented by 11 or 00, alternately, during each bit cell. AMI requires that the sending device maintain ones density. Ones density is not maintained independent of the data stream. | ||
Step 6 | Router(config-controller)# ds0-group ds0-group-no timeslots timeslot-list type {e&m-fgd | fgd-eana}
| This command defines the T1 channels for use by compressed voice calls as well as the signaling method the router uses to connect to the PBX or CO. The ds0-group-no parameter is a value from 0 through 23 that identifies the DS0 group.
The value timeslot-list is a single number, numbers separated by commas, or a pair of numbers separated by a hyphen to indicate a range of timeslots. For T1, allowable values are from 1 through 24. To map individual DS0 time slots, define additional groups. The system maps additional voice ports for each defined group. The signaling method selection for type depends on the connection that you are making. The e&m-fgd setting allows E&M interface connections for PBX trunk lines (tie lines) and telephone equipment to use Feature Group D switched-access service. The fgd-eana setting supports the exchange access North American (EANA) signaling. | ||
Step 7 | Router(config-controller)# no shutdown | Activate the controller. | ||
Step 8 | Router(config-controller)# exit | Exit controller configuration mode. |
The following example configures FeatureGroup D access on Cisco 2600, 3600, and 7200 series routers:
controller T1 2/0 framing esf linecode b8zs ds0-group 0 timeslots 1-24 type e&m-fgd ! dial-peer voice 3 pots destination-pattern 02... direct-inward-dial port 2/0:0 prefix ,02
This section documents a modified command. All other commands used with this feature are documented in the Cisco IOS Release 12.1 and 12.1(3)T command references.
To define T1 channels for compressed voice calls and the channel-associated signaling (CAS) method by which the router connects to the PBX or PSTN, enter the ds0-group controller configuration command. The no form of the command removes the group and signaling setting.
ds0-group ds0-group-no timeslots timeslot-list type {e&m-immediate | e&m-delay | e&m-wink | e&m-fgd | fgd-eana}
Syntax Description Description
ds0-group-no A value from 0 through 23 that identifies the DS0 group. timeslot-list The value of timeslot-list is a single time-slot number, a single range of numbers, or multiple ranges of numbers separated by commas. For T1, allowable values are from 1 through 24. Examples are: type The signaling method selection for type depends on the connection that you are making. The E&M interface allows connection for PBX trunk lines (tie lines) and telephone equipment. The options are as follows:
Defaults
There is no DS0 group.
Command Modes
Controller configuration
Command History
11.3 MA The command was introduced as the voice-group command for the Cisco MC3810 multiservice access concentrator. 12.0(5)XK and 12.0(7)T The command was introduced for the Cisco 2600 and 3600 series with a different name and some keyword modifications. 12.1(2)XH and 12.1(3)T The command was modified for Feature Group D signaling.
Release
Modification
Usage Guidelines
The ds0-group command automatically creates a logical voice port that is numbered as follows on Cisco 2600 and 3600 series routers: slot/port:ds0-group-no. Although only one voice port is created for each group, applicable calls are routed to any channel in the group.
Examples
The following example configures ranges of T1 controller time slots for FXS ground-start and FXO loop-start signaling:
controller T1 1/0 framing esf linecode b8zs ds0-group 1 timeslot 1-10 type e&m-fgd
Related Commands
Posted: Tue Sep 19 17:30:29 PDT 2000
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