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Configure the Video Interop Server in Skype for Business Server

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Summary: Configure the Video Interop Server (VIS) role in Skype for Business Server.

Configure the settings that the VIS associates with video trunks using Windows PowerShell. A video trunk configuration with global scope is created once the VIS service is installed. This video trunk configuration applies to the VIS to all trunks, which don't have video trunk configuration with a more specific scope. The video trunk configuration is a collection of settings that is applicable to video trunks.

Configure video trunk and dial plan

Use the following Windows PowerShell commands to specify the video trunk configuration and dial plan to be associated with the newly defined trunk(s) defined in the Topology Document between the VIS and all Video Gateways. All these settings can be set at the Global, Site, or service (Video Gateway) levels.

A dial plan with global scope is created per Skype for Business Server deployment. This dial plan is applied by VIS to all trunks, which don't have any dial plan with more specific scope.

Configure the VIS using Windows PowerShell

  1. Create a new video trunk configuration (a collection of settings) to use on the trunk between the VIS and Cisco Unified Communications Manager (CallManager, or CUCM), using the following Windows PowerShell cmdlet:

    New-CsVideoTrunkConfiguration -Identity "Service:VideoGateway:CUCMVIS1.CUCMInterop.contoso.com" -GatewaySendsRtcpForActiveCalls $false -GatewaySendsRtcpForCallsOnHold $false -EnableMediaEncryptionForSipOverTls $true(or $false)

    If there's an existing video trunk that needs to be modified, use the following Windows PowerShell cmdlet:

    Set-CsVideoTrunkConfiguration -Identity "Service:VideoGateway:CUCMVIS1.CUCMInterop.contoso.com" -GatewaySendsRtcpForActiveCalls $false -GatewaySendsRtcpForCallsOnHold $false -EnableMediaEncryptionForSipOverTls  $true(or $false)

    To view the settings associated with a particular video trunk configuration, use the following Windows PowerShell cmdlet:

    Get-CsVideoTrunkConfiguration -Identity "Service:VideoGateway:CUCMVIS1.CUCMInterop.contoso.com"

    To remove a particular video trunk configuration, use the following Windows PowerShell cmdlet (note that the globally scoped video trunk configuration applies if there isn't a more specifically scoped video trunk configuration for a particular trunk):

    Remove-CsVideoTrunkConfiguration -Identity "Service:VideoGateway:CUCMVIS1.CUCMInterop.contoso.com"

  2. Establish a dial plan to associate with the trunk, using the following Windows PowerShell cmdlets:

    New-CsDialPlan -Identity "Service:VideoGateway:CUCMVIS1.CUCMInterop.contoso.com" -SimpleName "TrunkTestDialPlan" 
New-CsVoiceNormalizationRule -Identity "Service:VideoGateway:CUCMVIS1.CUCMInterop.contoso.com/SevenDigitRule" -Pattern '^(\d{7})$' -Translation '+1425$1' 
Get-CsDialPlan -Identity "Service:CUCMVIS1.CUCMInterop.contoso.com"
Remove-CsVoiceNormalizationRule -Identity  "Service:VideoGateway:CUCMVIS1.CUCMInterop.contoso.com/Keep All"

The Remove-CsVoiceNormalizationRule command is needed to override a default rule that interferes with the expected VIS and CUCM interaction.

Note

Remove-CsDialPlan can be used to remove a dial plan.

For a video SIP Trunk call from a Video Gateway whose Request URI contains a non-E.164 number, VIS reads the name of the dial plan associated with the associated trunk, and includes the dial plan name in the phone context part of the Request URI in the Invite that VIS sends to the Front End. The Translation Application on the Front End then extracts and applies the normalization rules associated with the dial plan to the Request URI.

Trunk configuration options

The Windows PowerShell cmdlets for video trunk configuration mentioned previously were new to Skype for Business Server 2015. The settings associated with video trunk configuration require a brief explanation.

GatewaySendsRtcpForActiveCalls This parameter determines whether RTCP packets are sent from the VTC to the VIS for active calls. An active call in this context is a call where media is allowed to flow in at least one direction. If GatewaySendsRtcpForActiveCalls is set to True, VIS can terminate a call if it doesn't receive RTCP packets for a period exceeding 30 seconds. The default is True.

GatewaySendsRtcpForCallsOnHold This parameter determines whether RTCP packets continue to be sent across the trunk for calls that are placed on hold and no media packets are expected to flow in either direction. VIS can terminate the call, if there are no RTCP packets flowing from the VTC to VIS while the call is on Hold. The default is True. When the SIPTransport protocol is set to TCP, this setting is ignored.

EnableMediaEncryptionForSipOverTls This parameter enables or disables SRTP for media when the SIPTransport protocol is set to TLS. The default is True. When the SIPTransport protocol is set to TCP, this setting is ignored.

EnableSessionTimer This parameter enables or disables session timers on the VIS side for each SIP dialog associated with the video SIP trunk. The default is False.

ForwardErrorCorrectionType This parameter is used to determine if Forward Error Correction (FEC) for video streams is to be applied on the leg between the Video Interop Server and a Video Gateway. Setting ForwardErrorCorrectionType to "None" turns off FEC between VIS and Video Gateway/VTC. Setting ForwardErrorCorrectionType to "Cisco" enables FEC compatible with Video Gateways by Cisco, such as Cisco Unified Communications Manager (CUCM). The default is None.

See also

Configure CUCM for Interoperation with Skype for Business Server