MicroNet Technology IP TELEPHONY GATEWAY SP5052 - Manual (Page 9)

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Note: Some connection failed is derived the PC COM Port. If user cannot open
the com port, for example com 1, please try another com port, ex.com port
2.
4. Configure the COM Port Properties as following:
(1) Bits per second : 9600
(2) Flow control : None
Press ‘OK’ button, and start to configure VoIP FXO gateway.