Escalate calls orchestrator with time out.

EscalateCallsOrchestrator.cs

using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.DurableTask;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace DurableFunctions.Demo.DotNetCore.EscalateCalls
{
    public class EscalateCallsOrchestrator
    {
        [FunctionName(nameof(EscalateCallsOrchestrator))]
        public async Task Run(
          [OrchestrationTrigger] IDurableOrchestrationContext context,
          ILogger logger)
        {
            var maxWaitTimePerCall = TimeSpan.FromMinutes(5);

            await context.CallActivityAsync("MakeCall", "phonenumber1");
            // Orchestrator will wait until Call1 event is received or maxWaitTime is passed.
            var resultCall1 = await context.WaitForExternalEvent<bool>("Call1", maxWaitTimePerCall, false);
            if (!resultCall1)
            {
                // Call1 has not been received within maxWaitTime. Let's try Call2. 
                await context.CallActivityAsync("MakeCall", "phonenumber2");
                // Orchestrator will wait until Call2 event is received or maxWaitTime is passed.
                var resultCall2 = await context.WaitForExternalEvent<bool>("Call2", maxWaitTimePerCall, false);

                if (!resultCall2)
                {
                    // Call2 has not been received within maxWaitTime. Let's try Call3.
                    await context.CallActivityAsync("MakeCall", "phonenumber3");
                    // Orchestrator will wait until Call3 event is received or maxWaitTime is passed.
                    var resultCall3 = await context.WaitForExternalEvent<bool>("Call3", maxWaitTimePerCall, false);
                }
            }
        }
    }
}