Acim And Pstn Detection; Acim Settings; Figure 12: Analog Trunk Added As Failover - Grandstream Networks UCM6 Series Manual

Figure 12: Analog Trunk added as Failover

ACIM AND PSTN DETECTION

UCM6xxx series support ACIM and PSTN detections modules allowing auto-detection and configuration of
PSTN lines, this helps getting best parameters to use on PSTN lines avoiding common issues when it comes
to use PSTN lines such echo, noise, calls not ended when remote party ends the call.

ACIM Settings

Users may sometimes face audio quality issues like noise, echo, audio volume level and choppy voice issues,
this is mostly related to impedance parameters not configured correctly on the FXO ports.
Please follow the below steps to configure ACIM Settings:
1. Go to PBX SettingsInterface SettingsAnalog Hardware.
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UCM6XXX Analog Trunks Guide