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host: commonsipvcr

Configuring global connection settings

You can modify the global connection settings for the IP VCR by going to Settings > Connections. However, many of these values can be overwritten by other IP VCR or endpoint settings.

Connection settings

Refer to this table for assistance configuring the connection settings. After making any configuration changes, click Apply changes.

 

Field Field description Usage tips
Maximum video size

Identifies the greatest video size that the IP VCR will send and receive when connected to a video endpoint.

This option is only available if the MCU 4CIF (HRO) feature key is present.

Motion / sharpness trade off

Choose the unit-wide/blade-wide setting for motion/sharpness trade off. The options are:

  • 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 an endpoint.

Transmitted video resolutions

Choose the unit-wide/blade-wide setting for transmitted video resolutions. This setting can be overridden by individual configured endpoint settings.

Retain the default setting (Allow all resolutions) unless you are experiencing problems with the display of certain resolutions by endpoints.

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. In these cases, you might want to use this setting to restrict the resolutions available to the IP VCR.

Note that you can configure this setting for individual configured endpoints if you do not need to restrict transmitted video resolutions for all endpoints.

Default bandwidth from IP VCR

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

When the IP VCR makes a call to an endpoint, the IP VCR chooses the maximum bandwidth that is allowed to be used for the media channels which comprise that call. This field sets that maximum bandwidth, and is the total bandwidth of the audio channel and video channel combined. (for more inofmration, see Creating video recordings.)

This setting can be overridden by individual endpoints' Preferred bandwidth from IP VCR values.

Default bandwidth to IP VCR

Sets the bandwidth that the IP VCR will advertise to the endpoint when it calls it.

This setting can be overridden by individual endpoints' Preferred bandwidth to IP VCR values.

Default incoming call action

Determines what the user experience will be when they call the IP VCR.

  • Connect to auto attendant
    The user will be presented with the default auto attendant from which they can view stored recordings or potentially make a recording of the session (see Using an auto attendant).
  • Record session
    The user will be presented with the video recording screen (see Using the recording console), allowing them to record the video from their endpoint.
  • Disconnect caller
    Users cannot call the IP VCR in this way; the call will be terminated.

The default call action is applied to calls to:

  • the IP address of the IP VCR
  • to E.164 numbers that do not match a specific recording or folder ID (using the service prefix). In this case, if the default action is Record session, the recording will be made into the root folder of the IP VCR and the recording will be given the numbers that follow the dialed service prefix as the recording ID.
    For example, if the registered service prefix is 33 and the dialed number is 331234 (and 1234 does not already match a recording or folder ID) a recording will be made in the root folder with the recording ID: 1234
    For more information refer to Configuring gatekeeper settings.

Recording a session uses one recording port.

Show recording participant names

Controls whether participant names will be overlaid onto the recorded video when making a point-to-point recording.

You may want to disable the overlaying of names by the IP VCR if the devices in the call add their own text to their video streams.

Advanced settings

You typically only need to modify these advanced settings if you are working with a support engineer or setting up more complicated configurations.

 

Field Field description Usage tips
Audio codecs from IP VCR

Restricts the IP VCR's choice of audio codecs to be used for receiving audio from the endpoints.

When communicating with an endpoint, the IP VCR receives a list of supported audio codecs from the endpoint. The IP VCR chooses an audio codec from those available, and sends audio data to the endpoint in that format.

Audio codecs to IP VCR

Which audio codecs the IP VCR advertises to remote endpoints, restricting the endpoints' choice of channels available for sending audio data to the IP VCR.

 

Video codecs from IP VCR

Restricts the IP VCR's choice of video codecs to be used for receiving video from the endpoints.

When communicating with an endpoint, the IP VCR receives a list of supported video codecs from the endpoint. The IP VCR chooses a video codec from those available, and sends video data to the endpoint in that format.

Video codecs to IP VCR

Which video codecs the IP VCR advertises to remote endpoints, restricting the endpoints' choice of channels available for sending video data to the IP VCR.

 

Video transmit size optimization

Allows the IP VCR to vary the resolution and codec of the video being sent to a remote endpoint within the video channel established to that endpoint. The options are:

  • None: Do not allow video size to be changed during transmission
  • Dynamic resolution only: Allow video size to be optimized during transmission
  • Dynamic codec and resolution: Allow video size to be optimized during transmission and/or dynamic codec selection

With this option enabled, the IP VCR can, for instance, decide to send CIF video within a 4CIF channel if this will increase the viewed video quality.

The circumstances under which decreasing the video resolution can improve the video quality include:

  • if the original size of the viewed video is smaller than the outgoing channel
  • if the remote endpoint has used flow control commands to reduce the bandwidth of the IP VCR video transmission

Typically, lowering the resolution means that the IP VCR can transmit video at a higher frame-rate.

Video resolution selection mode

This setting can be used to influence the choice of outgoing video resolution made by the IP VCR in certain circumstances.

  • Default
    The IP VCR will use its normal internal algorithms to dynamically decide which resolution to send in order to maximize the received video quality.
  • Favor 448p
    The IP VCR will heavily favor sending 448p or w448p video (resolutions of 576 x 448 and 768 x 448 pixels respectively) to those endpoints that are known to work best with these resolutions.

You should leave this at Default unless your environment dictates 448p or w448p resolutions only.

Video format

The video format used and transmitted by the IP VCR.

  • NTSC - 30fps
    The IP VCR will favor transmitting video at 30 frames per second, at SIF-like resolutions.
  • PAL - 25fps
    The IP VCR will favor transmitting video at 25 frames per second, at CIF-like resolutions.

NTSC is typically used in North America, while PAL is typically used in the UK and Europe. Setting this field to match the most common type of endpoint used with the IP VCR will improve the smoothness of the video sent by the IP VCR to the endpoints.

Regardless of how this setting is configured, the IP VCR will accept video from endpoints at either frame-rate.

Maximum transmitted video packet size

The maximum payload size (in bytes) of the packets sent by the IP VCR for outgoing video streams (from the IP VCR to connected video endpoints).

Typically, you only need to set this value to lower than the default (1400 bytes) if there was a known packet size restriction in the path between the IP VCR and potential connected endpoints.

Video streams generally contain packets of different lengths. This parameter only sets the maximum size of a transmitted network datagram. The IP VCR optimally splits the video stream into packets of this size or smaller. Thus, most transmitted packets will not reach this maximum size.

Interlaced video optimization

Whether the IP VCR restricts video resolutions in order to reduce the effect of interlacing artifacts.

You should only enable this option if you are seeing video interlacing artifacts or on the advice of Customer support. Note that all resolution restrictions imposed by this setting apply only to video being sent from endpoints to the IP VCR.

Video receive bit rate optimization

Enables the IP VCR to send bandwidth control messages to optimize the video bandwidth being used.

The IP VCR can send these messages to endpoints requesting that the bandwidth of the video that they are sending be decreased or increased, up to the maximum bandwidth of the channel.

Flow control on video errors

Enables the IP VCR to request that the endpoint send lower speed video if it fails to receive all the packets which comprise the far end's video stream.

The IP VCR can send these messages to endpoints requesting that the bandwidth of the video that they are sending be decreased based on the quality of video received by the IP VCR.

If there is a bandwidth limitation in the path between the endpoint and the IP VCR, it is better for the IP VCR to receive every packet of a lower rate stream than to miss some packets of a higher rate stream.

Use recording or folder name as caller / called ID

When selected, the recording or folder name is used for the ID instead of the default device name.

When selected, the called ID for calls in to the IP VCR will be:

  • the recording's name for calls directly to a recording for play back
  • the default device name for calls to the (unnamed) root folder's auto attendant, recording ID or recording console ID
  • the folder's configured name for calls to a (named) non-root folder's auto attendant, recording ID or recording console ID

Note: When an endpoint calls the IP VCR to start a point-to-point recording, it will see the called ID as the remote device name rather than the IP VCR.

When selected, the caller ID for calls from the IP VCR will be:

  • the recording's name when calling out to play back a recording
  • the specified recording name when calling out to make a new recording
  • the default device name when calling out to make a new recording in the root folder with no recording name specified
  • the folder's configured name when calling out to make a new recording in a non-root folder with no recording name specified

With this setting is not selected, the caller/called ID is the name of the IP VCR.

Advertise out of band DTMF

If this option is selected, the IP VCR advertises the ability to receive out of band DTMF.

If this option is selected, endpoints are allowed to send out of band DTMF. If this option is not selected, the IP VCR will not advertise the ability to accept out of band DTMF and endpoints will instead be forced to use in band DTMF.

Prior to release 3.0, the IP VCR always advertised to endpoints the ability to receive out of band DTMF tones. Now you can disable this functionality if required. If you clear this option, endpoints are forced to send DTMF in band (in the audio channel). This means that the IP VCR can pass DTMF tones on to an audio conferencing bridge.

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