Symptoms
Microsoft Unified Communications Web API (UCWA) may crash in a Microsoft Lync Server 2013 environment.
In addition, the following event is logged on the Lync Server 2013 Front End server:
Log Name: Lync Server
Source: LS UCWA
Date: Date/Time
Event ID: 20003
Task Category: (1099)
Level: Error
Keywords: Classic
User: N/A
Computer: ServerName
Description:
UCWA encountered an unhandled exception.
Exception: System.ArgumentException: The string argument value is invalid: 'panoramic-video'
Parameter name: settings.AvailableMediaTypes
at Microsoft.Rtc.Signaling.ArgumentVerifier.ThrowOnNullEmptyOrInvalidStringInCollectionCore(IEnumerable`1 collection, String paramName, Predicate`1 isValid)
at Microsoft.Rtc.Collaboration.ConferenceInvitation..ctor(Conversation conversation, ConferenceInvitationSettings settings)
at Microsoft.Rtc.Internal.Ucwa.Communication.ServiceConversation.AddSipUserAsync(ServiceInvitation serviceInvitation)
at Microsoft.Rtc.Internal.Ucwa.Communication.ServiceConversation.AddUserAsync(ServiceInvitation serviceInvitation)
at Microsoft.Rtc.Internal.Ucwa.Communication.ServiceConversation.AddUser(ServiceInvitation serviceInvitation)
at Microsoft.Rtc.Internal.Ucwa.Communication.ServiceConversationManager.AddUserOrCall(String primaryServiceConversationId, InvitationResource invitationResource, InvitationType invitationType)
at Microsoft.Rtc.Internal.Ucwa.Web.ParticipantInvitationsController.PostAddParticipantInvitation(ApplicationInstance application, InvitationContextQueryParameters invitationContext, AddParticipantInvitationInput addParticipantInvitationInput)
at lambda_method(Closure , Object , Object[] )
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass13.<GetExecutor>b__c(Object instance, Object[] methodParameters)
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)
at System.Threading.Tasks.TaskHelpers.RunSynchronously[TResult](Func`1 func, CancellationToken cancellationToken)
Cause: An unhandled exception happened.
Resolution:
Restart the server. If the problem persists contact product support.
Resolution
To fix this issue, install the July 2017 cumulative update 5.0.8308.992 for the Lync Server 2013, Web Components Server.
