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Cisco BTS 10200 Softswitch Troubleshooting Guide, Release 5.0.x
OL-8723-19
Chapter 14 General Troubleshooting
NCS I10 and Audit Connection Troubleshooting
Troubleshooting QoS
Problem: Endpoint does not support silence suppression and/or echo cancellation.
Symptom: Silence suppression and/or echo cancellation parameters provisioned on the Cisco BTS 10200
Softswitch are not reflected in MGCP device behavior.
Diagnosis:
1.
Through CLI commands, take the MGCP device out of service. Make sure to take the entire MGCP
device out of service (control mgw...) because disabling the terminations is not sufficient.
2.
Put the MGCP device back in service.
Use network packet analysis software to observe the response to an AUEP command. Look through each
"A:" (capabilities) line and verify that "s:on" (silence suppression supported) and/or "e:on" (echo
cancellation supported) are not present.
Resolution:
•
If the endpoint reports "e:on" in its capabilities, but provisioned echo cancellation settings are
ignored, verify that EC-SUPP is enabled for the MGCP device in the mgw-profile table (see the
"Provisioning MGCP Command Timeout and QoS Parameters" section).
•
Upgrade the MGCP device firmware.
•
Contact the device manufacturer if the MGCP device advertises support for silence
suppression/echo cancellation but does not report it to the CA.
Troubleshooting Audit Connection
Problem: Stray connections have not been removed after failover.
Symptoms: Endpoint(s) unable to place feature calls, dropped active calls after a Cisco BTS 10200
Softswitch failover.
Diagnosis: Place a call through the endpoint. Use network packet analysis software to observe any
negative CreateConnection (CRCX) ACK responses from the MGCP device. Check whether error
messages in the negative ACK responses indicate that connection resources are not available (which
suggests that the resources are not being cleaned up).
Resolution: Enable AuditConnection support for MGCP profile corresponding to MGCP device.