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Chapter 7 - Troubleshooting
Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide 27
You can narrow the list of possibilities by using extended result codes. Extended result codes are enabled by
default. If they have been disabled, include V1X4 in the modem’s initialization string, or in terminal mode
enter ATV1X4 and press E
NTER. When you dial again, the modem reports the call’s progress.