Optimizing Trunk Settings

This page describes the steps to optimize and tune the DAHDI (Analog) trunks on your UCx system.

Echo Cancellation

  1. Set the Receive Gain and Transmit Gain values to 0.0
    • ​If your system uses software release 4.5 or newer, go to PSTN Cards - Settings and open Global Settings
    • If your system uses software release 4.0, go to PBX -> Tools tab and use Configuration File Editor to edit the file chan_dahdi.conf
      rxgain=0.0
      txgain=0.0
  2. Start a SSH session to your UCx server (e.g. use PuTTY) and login as admin.
  3. Execute the command ucx_ectune x where x is the number of ports to test starting from port 1 to port x. For example, if you have a 4-port card, enter the command ucx_ectune 4 to test all 4 ports. If you have a 8-port card, entering the command ucx_ectune 5 will test the first 5 ports, where the leftmost port on the card is port 1.

This will stop the Call Processing Service and place the system out of service for approximately 1 minute per trunk.  It will then reboot the system. We recommend you do this during a service/maintenance window.

Volume

To adjust the DTMF Volume of analog ports, go to the Digital Gateway Device Configuration page. When you use analog ports for fax or data, make sure Echo Cancellation and Automatic Gain Control for analog devices is disabled.

Delay in Handling Incoming Calls

With analog trunks, the system is configured to wait for the caller ID for up to 8 seconds before continuing; this could be the first two rings. If you do not have caller ID on your trunks, you should disable Use Caller ID.

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