Overview - Cisco BTS 10200 Troubleshooting Manual

Network Loopback Test for Network-based Call Signaling/Media Gateway Control Protocol Endpoints

Overview

The Network Loopback Test for NCS/MGCP Endpoints feature provides a testing device with the
capability to perform network loopback tests from any line side NCS/MGCP residential gateways or
media termination adapters (MTAs). These loopback tests are initiated from designated test endpoints
(subscribers) controlled by the BTS 10200.
The basic network loopback test feature which was implemented in Release 4.4 is service affecting. In
other words, while a network loopback call is in progress, the endpoint is considered busy.
In this release, the BTS 10200 network loopback and network continuity tests also has a service not
affected mode. In this mode, the BTS 10200 will attempt to create coexisting test connection on the test
device, however if the endpoint does not have enough resources the BTS 10200 will provide preference
to regular calls over any test calls.
In the service affected mode the BTS 10200 will not try to perform other calls, even if the test
MTA/TGW has capability to perform multiple connections (PARALLEL-TEST-CONN-SUPP=Y).
The BTS 10200 allows the system level configuration to specify whether the network loopback and
network continuity test calls will be service affecting or not service affecting.
Restrictions
Although you can test this feature by using the regular MTA as the testing device by configuring the
endpoints as subscriber terminations in BTS 10200, you need special test equipment such as BRIX if
voice quality testing needs to be done.
You should configure the testing and tested devices on the same Call Agent. The BTS 10200 cannot
perform network loopback test calls that originate from another switch and does not route calls from a
testing device on an H.323 or SIP interface.
You cannot perform the network loopback test if the status of the subscriber to be tested is unequipped
Note
(UEQP) or operational-out-of-service (OOS).
Installing
The following items must be configured:
•
•
Configuring
In order for parallel test connections to work, the following settings need to be configured in the
ca-config:
add ca-config type=NLB-TEST-SERVICE-AFFECTING; datatype=BOOLEAN; value=N;
add ca-config type=NCT-TEST-SERVICE-AFFECTING; datatype=BOOLEAN; value=N;
Cisco BTS 10200 Softswitch Troubleshooting Guide, Release 5.0.x
15-42
Test origination endpoints as trunks instead of line.
Special dial plan and destination with CALL-TYPE TEST-CALL; CALL-SUBTYPE=NLB-TEST).
Chapter 15 Diagnostic Tests
OL-8723-19