Multiple Trunk Groups on a Single ISDN D Channel
Introduction
The Cisco BTS 10200 Softswitch supports ISDN 23B+D on a single T1 port with the ability to define explicit routing from a DN to a group of CICs or DS0s. To support using a different DN to route to an ISDN 23B+D, multiple trunk groups must be provisioned on a single D channel. The trunk group is a logical entity used to group a range of B-channels or a single B-channel in a D channel (ISDN T1). Specific DNs can be associated with the trunk groups for explicit routing of a DN to a specific range of B-channels in the ISDN D channel (23B+D).
Provisioning
This section describes provisioning multiple trunk groups on a single ISDN D channel.
Step 1 
Add one ISDN D channel id.
add isdn-dchan id=40089; dchan-type=primary; dchan-format=slot-port;
dchan-slot=2;dchan-port=21;sctp_assoc_id=c5400_102;
backhaul-type=IUA;isdn_dchan-profile-id=NI2; dchan-intf=0;
Step 2 Provision multiple trunk groups to the same ISDN D channel id (40089). In this example, six trunk groups are provisioned: 9950, 9951, 9952, 9953, 9954, 9955 are provisioned.
add trunk-grp id=9950;call-agent-id=CA146;tg-type=ISDN;tg-profile-id=tb78-isdn-dchan1;
pop-id=tb78;GLARE=ALL;mgcp-pkg-type=T; dial-plan-id=tb78;isdn-dchan-id=40089;
add trunk-grp id=9951;call-agent-id=CA146;tg-type=ISDN;tg-profile-id=tb78-isdn-dchan1;
pop-id=tb78;GLARE=ALL;mgcp-pkg-type=T; dial-plan-id=tb78;isdn-dchan-id=40089;
add trunk-grp id=9952;call-agent-id=CA146;tg-type=ISDN;tg-profile-id=tb78-isdn-dchan1;
pop-id=tb78;GLARE=ALL;mgcp-pkg-type=T; dial-plan-id=tb78;isdn-dchan-id=40089;
add trunk-grp id=9953;call-agent-id=CA146;tg-type=ISDN;tg-profile-id=tb78-isdn-dchan1;
pop-id=tb78;GLARE=ALL;mgcp-pkg-type=T; dial-plan-id=tb78;isdn-dchan-id=40089;
add trunk-grp id=9954;call-agent-id=CA146;tg-type=ISDN;tg-profile-id=tb78-isdn-dchan1;
pop-id=tb78;GLARE=ALL;mgcp-pkg-type=T; dial-plan-id=tb78;isdn-dchan-id=40089;
add trunk-grp id=9955;call-agent-id=CA146;tg-type=ISDN;tg-profile-id=tb78-isdn-dchan1;
pop-id=tb78;GLARE=ALL;mgcp-pkg-type=T; dial-plan-id=tb78;isdn-dchan-id=40089;
Step 3 Provision one T1 endpoint to the 23 B-channels.
add termination prefix=S2/DS1-21/; port-start=1; port-end=23; type=trunk;
mgw-id=mgw_5400_isdn;
Step 4 Provision a group of B-channels to a specific trunk-group
add trunk cic-start=1; cic-end=7; tgn-id=9950; mgw-id=mgw_5400_isdn;
termination-prefix=S2/DS1-21/; termination-port-start=1; termination-port-end=7;INTF=0;
add trunk cic-start=8; cic-end=13; tgn-id=9951; mgw-id=mgw_5400_isdn;
termination-prefix=S2/DS1-21/; termination-port-start=8; termination-port-end=13;INTF=0;
add trunk cic-start=14; cic-end=15; tgn-id=9952; mgw-id=mgw_5400_isdn;
termination-prefix=S2/DS1-21/; termination-port-start=14; termination-port-end=15;INTF=0;
add trunk cic-start=16; cic-end=17; tgn-id=9953; mgw-id=mgw_5400_isdn;
termination-prefix=S2/DS1-21/; termination-port-start=16; termination-port-end=17;INTF=0;
add trunk cic-start=18; cic-end=20; tgn-id=9954; mgw-id=mgw_5400_isdn;
termination-prefix=S2/DS1-21/; termination-port-start=18; termination-port-end=20;INTF=0;
add trunk cic-start=21; cic-end=23; tgn-id=9955; mgw-id=mgw_5400_isdn;
termination-prefix=S2/DS1-21/; termination-port-start=21; termination-port-end=23;INTF=0;
Step 5 Provision a dial plan for each of the six destination trunk groups.
a. Add the destination ID.
add destination dest-id=9950; call-type=local; route-type=route; route-guide-id=9950;
add destination dest-id=9951; call-type=local; route-type=route; route-guide-id=9951;
add destination dest-id=9952; call-type=local; route-type=route; route-guide-id=9952;
add destination dest-id=9953; call-type=local; route-type=route; route-guide-id=9953;
add destination dest-id=9954; call-type=local; route-type=route; route-guide-id=9954;
add destination dest-id=9955; call-type=local; route-type=route; route-guide-id=9955;
b. Add the dial plan ID.
add dial-plan id=tb78;digit-string=469450; dest-id=9950;
add dial-plan id=tb78;digit-string=469451; dest-id=9951;
add dial-plan id=tb78;digit-string=469452; dest-id=9952;
add dial-plan id=tb78;digit-string=469453; dest-id=9953;
add dial-plan id=tb78;digit-string=469454; dest-id=9954;
add dial-plan id=tb78;digit-string=469455; dest-id=9955;
c. Add the route guide ID.
add route-guide id=9950;policy-type=ROUTE; policy-id=9950;
add route-guide id=9951;policy-type=ROUTE; policy-id=9951;
add route-guide id=9952;policy-type=ROUTE; policy-id=9952;
add route-guide id=9953;policy-type=ROUTE; policy-id=9953;
add route-guide id=9954;policy-type=ROUTE; policy-id=9954;
add route-guide id=9955;policy-type=ROUTE; policy-id=9955;
d. Add the route ID.
add route id=9950;tgn1-id=9950;
add route id=9951;tgn1-id=9951;
add route id=9952;tgn1-id=9952;
add route id=9953;tgn1-id=9953;
add route id=9954;tgn1-id=9954;
add route id=9955;tgn1-id=9955;
Sample Line Test Configuration for Multiple Trunk Groups on a Single ISDN D Channel
A single ISDN 23B+D can support multiple test lines to run different tests. Each B-channel in the ISDN 23B+D is connected to a different type of test and requires a different DN to route to the test destination.
Table 2-1 provides a sample ISDN 23B+D line test configuration supporting multiple trunk groups. Each trunk group in the D channel is routed using a different DN (one T1 Port per slot or port).
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