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This topic describes how to customize AT0 parameters when configuring AT0 trunks for offices outside China.
When configuring AT0 trunks for offices outside China, you must set the parameters listed in the following table based on the local standards.
Common Parameter |
Description |
Impedance |
FXS ports at the carrier side are connected to local FXO ports. The voice transmission quality is best and echoes are lowest only when impedance values on both ends of a link are the same. |
Signal tone detection |
Signal tone detection parameters of FXO ports are used to recognize the ringback tone, busy tone, dial tone, howler tone, or congestion tone sent from the peer office so that the local PBX can process these tones. |
Signal tone transmission |
Signal tone transmission parameters are used by FXS ports to send signal tones to lower-level offices. You are advised to set these parameters to local standard values to comply with local users' habits. |
Before the unified gateway is delivered, AT0 signal tone and impedance parameters have been set for some countries including China, Australia, Brazil, United Kingdom, France, Germany, Ireland, Italy, Malaysia, Mexico, New Zealand, Russia, and Saudi Arabia. (By default, parameter settings for China are used.) To set the signal tone and impedance parameters to local standard values, select the corresponding country or region by referring to Configuring an AT0 Trunk. For other countries or regions, set the signal tone and impedance parameters by referring to Common AT0 Parameter Reference and (Customizing Typical Parameters (Using the Web Management System).
You are advised to perform the following operations to verify that AT0 trunk configurations can meet the requirements of an office:
ϒ⁄Verify basic incoming and outgoing calls, and key voice services configured in the office. Verify that the phones of called parties can ring properly, calls can be connected and released properly, and the CLIP function is normal.
ϒ⁄Initiate an incoming call. When the intra-office phone rings, do not pick up the phone. Hang up as the calling party. Verify that the local office can detect the busy tone correctly (when the intra-office phone stops ringing), and that AT0 trunk link resources are released in a timely manner.
ϒ⁄Check the voice quality of incoming and outgoing calls. Verify that no noise or echo exists.
ϒ⁄Verify that voice shearing does not occur during double-talk (that is, when the calling and called parties speak at the same time). Voice shearing means that the voice of the party whose volume is lower is filtered by the system as echoes.
ϒ⁄AT0 trunk calls are easily affected by noises if the device is not properly grounded. To improve call quality, ensure that the device is properly grounded. For details, see Grounding Guide.
ϒ⁄If signal tones cannot be detected or echoes exist in calls, automatically detect and obtain parameter settings from the carrier side and save them as local configurations by referring to Obtaining AT0 Interface Parameters.
ϒ⁄If the CLIP function is abnormal, check and customize related parameters by referring to Customizing Typical Parameters (Using the Web Management System).
ϒ⁄If other problems occur, detect and customize more parameters by referring to Customizing Other Parameters (Using the Web Management System).
Parent Topic: Customizing AT0 Interface Parameters