Get-OutgoingNumber.ps1

function Get-OutgoingNumber
{
    param(
    [Management.Automation.PSCredential]
    $Credential,

     # A setting storing the credential
    [Parameter(ValueFromPipelineByPropertyName=$true)]   
    [string[]]
    $Setting = @("TwilioAccountKey", "TwilioAccountSecret")
    
    )

    process {
    
        if (-not $Credential -and $Setting) {
            if ($setting.Count -eq 1) {

                $userName = Get-WebConfigurationSetting -Setting "${Setting}_UserName"
                $password = Get-WebConfigurationSetting -Setting "${Setting}_Password"
            } elseif ($setting.Count -eq 2)  {
                $userName = Get-secureSetting -Name $Setting[0] -ValueOnly
                $password= Get-secureSetting -Name $Setting[1] -ValueOnly
            }

            if ($userName -and $password) {                
                $password = ConvertTo-SecureString -AsPlainText -Force $password
                $credential  = New-Object Management.Automation.PSCredential $username, $password 
            } elseif ((Get-SecureSetting -Name "$Setting" -ValueOnly | Select-Object -First 1)) {
                $credential = (Get-SecureSetting -Name "$Setting" -ValueOnly | Select-Object -First 1)
            }                        
        }

        if (-not $Credential) {
            Write-Error "No Credential Provided"
            return

        }

        $getWebParams = @{
            WebCredential=$Credential
            Url="https://api.twilio.com/2010-04-01/Accounts/$($Credential.GetNetworkCredential().Username.Trim())/OutgoingCallerIds"           
            
            Method = "GET"
            UseWebRequest = $true
        }        
        
        Get-Web @getwebParams -AsXml |
            Select-Object -ExpandProperty TwilioResponse | 
            Select-Object -ExpandProperty OutgoingCallerIds |
            Where-Object {
                $_.OutgoingCallerId 
            }  |
            Select-Object -ExpandProperty OutgoingCallerId

       

    }
}