1.5 Administrator's Guide

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  3. 1.5 Administrator’s Guide
  4. Commissioning the unit
  5. Configuring Comma device ports
  6. Configuring Analogue Trunk (FXO) ports

Configuring Analogue Trunk (FXO) ports

To edit the configuration of an FXO port, double-click on the desired port from the ports tree on the right of the hardware panel.



Input gain

Indicates how much, if any, gain adjustment should be performed in the input direction. Values are in decibels.

Output gain

Indicates how much, if any, gain adjustment should be performed in the output direction. Values are in decibels.

Echo canceler

The echo cancellation delay and algorithm to be employed on the port. The delay up to which the echo canceler can compensate is specified in milli-seconds. An optional non-linear processing echo suppression algorithm (NLP) can also be employed during echo cancellation. If you expect the devices connected to the port to be in a noisy environment how-ever, you might prefer not to enable NLP, as it might result in the far-end noise being cut off when speech ceases. Some local users may find this uncomfortable. NLP is recommended for quiet remote environments. Please see section for a detailed discussion around echo cancellation.

Detect Fax

When enabled, the Com .X will differentiate between an incoming call and an incoming fax. Any echo cancellation configurations will be bypassed and the jitter buffer for the call adjusted for a higher tolerance, in the event of an incoming fax.

DID number

A direct inward dialing number to associate with this port. A call incoming on this port may be routed using the DID.

DID description

A custom description for the DID.

Detect caller ID

If this is enabled, the incoming caller ID, if available, will be detected and may be used in inbound routing.

Hangup detection

Devices such as Least Cost Routers connected to FXO ports, or the Telco equipment in various parts of various countries may signal hangup differently. Change this setting to match the tone set for the country of device deployment, or the duty cycle of the hangup signal you are receiving. Options include 250, 500 or 2500 ms of tone followed by the same period of silence and any regular pattern.

Note: if a country tone-set is not available for the country of deployment and as a result on of the available duty cycles is configured, it is possible that different exchanges routing inbound calls to the system might have different end-of-call tones.

This may result in FXO port lockup if the varying tones cannot be detected using the configured duty cycle. If this is the case, use the ‘Any regular pattern’ setting to detect such tones.

For more information on the options available to detect end-of-call under such conditions, please see the Com.X Trouble-shooting guide.