Merge pull request MicrosoftDocs#4661 from get-itips/patch-126

Adding note under SipSignalingPort

Author: kenwith

skype/skype-ps/skype/New-CsOnlinePSTNGateway.md

@@ -305,6 +305,7 @@ Accept wildcard characters: False
 
 ### -SipSignalingPort
 Listening port used for communicating with Direct Routing services by using the Transport Layer Security (TLS) protocol. Must be value between 1 and 65535.
+Please note: Spelling of this parameter changed recently from SipSignallingPort to SipSignalingPort.
 
 ```yaml
 Type: Int32