Q1: The phone does not always ring, when you called some of your existing numbers and what you hear on the cell phone is "the number you dialed is not answered, please redial later".
Go to “PRI Configuration-SIP Trunk”. Select the Detect Trunk Status as “No”.
Q2: Customers will hear current sound and noise when they make or receive calls.
Go to “PSTN Group Config-E1/T1 Parameter”, please check whether the frame format is correct, if you are not sure, ask the operator.
Q3: When a call comes in, it starts to counting time, but you cannot hear dial-tone, then it will be hang up automatically , and phone will not ring. Moreover, when you make outbound calls to cellphone number, and then hanging up before it is picked up, t
Maybe cause by the wrong ringback tone config. Please go to “IP Group Config-IP Profile”.
Ringback Tone to PSTN Originated from: IP
Ringback Tone to IP Originated from: PSTN
Q4: Why does the call got hang up once time of the call reaches 2 hours?
Maybe the problem of the call duration limit. Please go to “Configuration on Web Interface-Voice & FAX”, set the “Max Call Duration” as 0.
Q5: There is no "busy" voice when the landline dials the mobile phone which is on the call or is rejected by the phone. No operator's dial-tone recieved.
Maybe caused by the wrong ringback tone config. Please go to “IP Group Config-IP Profile”.
Ringback Tone to PSTN Originated from: Local
Ringback Tone to IP Originated from: PSTN
Q6: During a call, if you press mute on the phone and the call will be hung up automatically after a while.
The voice interrupt protection of E1 hangs up automatically when it finds no rtp packets. Please modify the Voice & Fax configuration. Set it as no.