Refer call disposition log at TxDialer or CDR report. 

Possible call failure reasons listed below ; Note : Assuming appropriate configuration at TxSmartQ and TxDialer campaign settings.

1. Unavailability of call channels at PRI or GSM Ports.
2. Network congestion at the site local network traffic.
3. Network issue at Network service provider end.
4. Other technical issue at PRI line or medial gateway.