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Configuring H.323 endpoints

You can configure H.323 endpoints to work with the IP VCR by choosing Endpoints > Add H.323. This makes it easier to call out to endpoints because you can select names from a list rather than adding network addresses. (For information about SIP endpoints, see Configuring SIP endpoints.)

Refer to the table below for tips on adding an H.323 endpoint to the IP VCR. After entering the settings, click Add endpoint. The endpoint appears in the Endpoint list.


Field Field description Usage tips

The name of the endpoint.


The IP address, host name, or an E.164 address (phone number).

You can configure this endpoint as needing to be reached via an H.323 gateway without that gateway being already configured on the IP VCR. To do this, set this field to be <gateway address>!<E.164>.

H.323 gateway

The gateway through which the endpoint connects.

To configure a gateway on the IP VCR, go to Gateways. For more information, refer to Adding and updating gateways.

DTMF sequence

The DTMF sequence to be sent to an audio conferencing bridge.

Allows the MCU to send DTMF tones to an audio bridge after the audio bridge has answered the call. In this way, the MCU can navigate audio menus. This is useful where a conference on the MCU dials out to an audio-only conference on an audio bridge.

You can configure an audio bridge with a DTMF sequence as a pre-configured endpoint (either H.323 or SIP) which can then be added to any conference. Alternatively, you can add the audio bridge to an individual conference as a participant. You must specify the DTMF sequence in the Call-out parameters for that endpoint. The DTMF sequence can include digits 0-9 and * and #. There is a two second pause after the call connects after which the MCU will send the DTMF tones which are sent one every half second. You can insert as many additional two second pauses as you want by inserting commas into the DTMF sequence. Each comma represents a two second pause.

For example, you want the MCU to dial out to a PIN-protected audio conference on an audio bridge. The conference ID is 555 and the PIN is 888. The audio bridge requires that you press # after entering the ID and after entering the PIN. In this example the DTMF sequence is: 555#,,888#. The two commas represent a four second pause which allows the audio bridge's automated menu system time to process the ID and request the PIN.

Call-in match parameters

These fields are used to identify incoming calls as being from the endpoint:

  • Name: This must be the name that the endpoint sends to the IP VCR
  • IP address: The IP address of the endpoint
  • E.164: The E.164 number with which the endpoint is registered with the gatekeeper

The endpoint is recognized if all filled-in fields in this section are matched. Fields left blank are not considered in the match.

When you configure Call-in match parameters, an endpoint is recognized as this pre-configured endpoint and the Connection parameters are applied to a call from this endpoint.

Motion / sharpness trade off

Select whether to use the unit-wide/blade-wide setting for motion/sharpness trade off, or configure an individual setting for use with this endpoint. Select from:

  • <use box-wide setting>: this is the default value. In this case, the connection to the endpoint will use the motion / sharpness tradeoff setting from the Settings > Connections page.
  • Favor motion: the IP VCR will try and use a high frame rate. That is, the IP VCR will strongly favor a resolution of at least 25 frames per second
  • Favor sharpness: the IP VCR will use the highest resolution that is appropriate for what is being viewed
  • Balanced: the IP VCR will select settings that balance resolution and frame rate (where the frame rate will not be less than 12 frames per second)

The settings for motion (frames per second) and sharpness (frame size or resolution) are negotiated between the endpoint and the IP VCR. This setting controls how the IP VCR will negotiate the settings to be used with this endpoint.

Transmitted video resolutions

Select the setting for transmitted video resolutions from the IP VCR to this endpoint. This setting overrides the unit-wide/blade-wide setting on the Settings > Connections page.

Retain the default setting (use box-wide setting) unless you are experiencing problems with the display of certain resolutions by this endpoint.

Endpoints advertise the resolutions that they are able to display. The IP VCR then chooses from those advertised resolutions, the resolution that it will use to transmit video. However, some endpoints do not display widescreen resolutions optimally. Therefore, you might want to use this setting to restrict the resolutions available to the IP VCR for transmissions to this endpoint.

Content contribution

Whether this endpoint is permitted to contribute a content channel when making a new recording.


Content receive

Whether this endpoint is allowed to receive a separate content stream when playing back a stored recording.


Preferred bandwidth from IP VCR

The network capacity (measured in bits per second) used by the media channels established by the IP VCR to a single participant.

These settings take priority over the Default bandwidth from IP VCR setting configured in the global Connection settings (see Connection settings).

Preferred bandwidth to IP VCR

The maximum combined media bandwidth advertised by the IP VCR to endpoints.

These settings take priority over the Default bandwidth to IP VCR setting configured in the global Connection settings (see Connection settings).

Custom codec selection

Used to ensure only specific codecs are permitted on calls to (and received from) this endpoint.

Select Enabled to display fields in which you can select the codecs to use when communicating with this endpoint. When Enabled, these selections override the unit-wide/blade-wide codec selection on the Settings > Connections page for this endpoint.

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