Voice Cut from GSM Trunk


  • Firmware version: any
  • Model: S50

Problem Description:

Yeastar S50 has ben installed two GSM modules, one is LTE and the other one is GSM-SIM800. The outbound calls from SIM800 to the outside party, the voice cut on the outside party. And everything well on the caller side.


1. Capture the SIP PCAP packet, and it shows voice is well.

2. So it may the GSM volume issue. Then do some test on it. Increase the TX gain from 40% to custom 12, 14, 16. Then the external party says the voice becomes better.



Change the TX gain volume and find a proper value the voice hears well.

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