GSM modules One way audio

I need help, i have a s300 with 4 GSM modules. It works normaly, but some day all calls form gsm modules start to One way audio. Another problem. On defalult VLAN (100) everyting work with yealink phones,I have more two vlans (101, 89) on s300, nat enable on exetension and networks added etc... But on linkus conected to IP on VLAN 89 i have One way audio but, with linkus client robot voice. Some One help!...


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