Microsoft Teams Phone Changes - Number Routing Logic Change

-

 If you are an O365 Admin, you may miss this or may not understand the MC847014 from the Message Center. Do contact your Direct Routing Service Provider/Teams connector provider or DRAAS provider.


Around the end of February 2023, Microsoft will be changing how numbers dialed by Teams users or arriving from the PSTN match the number assigned to users. This process is often referred to as Reverse Number Lookup (RNL). The change applies only to users with an assigned phone number where the last several digits of the base number are also added as the extension. For example, +14025557334;ext=334, where 334 is both included in the base number and as the extension. You are receiving this post, because our telemetry shows that you have users configured with phone numbers containing extensions identical to the last n digits of a base number such as +14025557334;ext=334. The users configured with this type of phone number are either Teams users or Skype for Business Server on-premises users. This may be a breaking change if your Teams dial plans and Direct Routing Session Border Controllers are not configured to convert dialed numbers into the full number assigned to the user including the extension.

What you need to do to prepare:
To prevent calls not being matched to the intended user, please ensure that dialed numbers from Teams users and incoming PSTN calls are formatted to exactly match the full phone number configured on the user accounts. Check that your tenant dial plans include normalization rules that can translate abbreviated dial strings to the full phone number configured on users. In example above, the following phone number normalization rule will translate a dialed 3-digit number to the full phone number configured on the users to ensure calls will succeed: • Pattern ^(\d{3})$ and Translation +14025557$1;ext=$1 Check that any phone number manipulation/translation rules used on your Direct Routing Session Border Controller are capable of making the translation to the full phone number configured on your users.

-------------------------------------------------------------------------------------------- 







Comments

Post a Comment

Popular posts from this blog

Troubleshooting Network Topology in Microsoft Teams Direct Routing

-
Image
  If you are playing around with location based routing or local media optimization in Microsoft Teams Direct Routing, you will have no doubt had to configure Trusted IPs and network sites in Microsoft Teams. In order for LBR or LMO to work correctly, a client needs to be determined to be “internal”. This is done using Trusted IPs and network subnets in the Network Topology section of the Teams Admin Center. It is often wise to check if what you have configured is correct. I’ve also found that trusted IPs can take a while to filter through the Teams service, so instead of waiting for stuff to miraculously work you can use the process below to check what your client thinks is going on. Alternatively, maybe the networking team has snuck in a new subnet without telling you, or the security team have changed the firewall IP and the clients no longer think they’re internal? I have also found that the  MediaLine_Description_ReflexiveLocalIPAddress_IPAddr  or  Connectivity_...
Read more

What is Office 365 and How It Works?

-
Office 365, now known as Microsoft 365, is a cloud-powered productivity platform that combines the familiar Microsoft Office applications with intelligent cloud services, providing an all-in-one solution for working professionals, students, and organizations. The subscription model ensures that users always have access to the most up-to-date tools, including Microsoft Teams, Word, Excel, PowerPoint, Outlook, OneDrive, SharePoint Online, and Microsoft Forms, among others. The primary advantage of Microsoft 365 is the seamless integration of its applications with the cloud. This allows users to easily access, store, and collaborate on documents from any device with an internet connection. Furthermore, the subscription service offers a range of plans catering to different user needs, such as for home and personal use, small and mid-sized businesses, large enterprises, schools, and non-profit organizations. Microsoft 365 also provides world-class security features to protect users and th...
Read more

Microsoft Teams Direct Routing: Should you use Media Bypass?

-
Image
I recently started looking at implementing Direct Routing in my organisation so I have been doing a fair bit of reading about it. Media bypass, on the face of it, seems like an absolute “must have” when it comes to Direct Routing. However, nothing is ever simple and due to the nature of Microsoft Teams being a cloud-based service as well as being relatively young, media bypass isn’t quite as simple as it could be. In it’s current guise Media Bypass has the following limitations: Media bypass is currently only supported with ICE Lite on the SBC side. This means that clients currently have to connect to the SBC on it’s public interface. This might be difficult for some enterprises to configure which might lead to firewall hair-pinning and actually diminish the advantages of media bypass anyway. Media bypass is not supported by the Teams web/browser clients. They recommend not enabling media bypass if the browser clients are going to be used. Media bypass is not supported for 3PIP devices...
Read more