Discover how Local Media Optimization in Microsoft Teams Direct Routing controls media traffic, keeps calls within corporate networks, and supports SBCs behind firewalls.
Table of Contents
Question
You have a Microsoft Teams Phone deployment.
You plan to deploy Direct Routing and manage voice quality to meet the following requirements:
- Control how media traffic flows between the Teams clients and the Session Border Controllers (SBCs).
- Keep media local within the boundaries of your corporate network subnets.
- Allow media streams between the Teams clients and the SBCs even if the SBCs are behind corporate firewalls that have private IP addresses.
What should you integrate with Direct Routing?
Select only one answer.
A. a mobility policy
B. a network roaming policy
C. DSCP tags
D. Local Media Optimization
Answer
To meet the requirements of controlling media traffic flows, keeping media local within corporate subnets, and allowing media streams between Teams clients and SBCs behind firewalls with private IPs, Local Media Optimization (LMO) must be integrated with Direct Routing.
D. Local Media Optimization
Explanation
Local Media Optimization for Direct Routing lets you manage voice quality by:
- Controlling how media traffic flows between the Teams clients and the SBCs.
- Keeping media local within the boundaries of corporate network subnets.
- Allowing media streams between the Teams clients and the SBCs even if the SBCs are behind corporate firewalls with private IP addresses and are not visible to Microsoft directly.
Key Features of Local Media Optimization
- Media Path Control: Directs media traffic between Teams clients and SBCs based on user location (internal/external network) using Microsoft-proprietary SIP headers like X-MS-UserLocation.
- Subnet Localization: Ensures media remains within corporate network boundaries when Teams clients and SBCs are on the same subnet, avoiding unnecessary traversal through Microsoft’s cloud relays.
- Firewall Compatibility: Allows SBCs with private IPs behind firewalls to handle media streams by offering internal/external media interfaces based on client accessibility.
How LMO Works
User Location Detection
Teams sends SIP headers (e.g., X-MS-UserLocation) to the SBC, indicating whether the user is internal or external.
Media Interface Selection
- For internal users, media flows via the SBC’s internal interface (private IP).
- For external users, media uses the SBC’s external interface (public IP).
Bypass Modes
- Always Bypass: Forces media to use the SBC’s local interface for internal users.
- OnlyForLocalUsers: Restricts local interfaces to users in the same network site.
Why Other Options Fail
- Mobility/Network Roaming Policies: Govern device connectivity but don’t control media paths.
- DSCP Tags: Prioritize network traffic for QoS but don’t influence media routing logic.
Local Media Optimization is explicitly designed for these scenarios, making D the correct answer. For implementation, configure LMO via PowerShell or Teams Admin Center, ensuring SBCs are certified for Direct Routing.
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