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Section 15. Extension Mobility Issues > Extension Mobility Calling and Call Rou...
Extension Mobility Calling and Call Routing Issues
The key points are as follows:
Device CSS is never modified by Extension Mobility.
Line CSS is changed by Extension Mobility.
When using local route groups, the line or device CSS approach
Applies the line CSS of the user device profile, and user CoS settings are enforced.
Device CSS is not modified.
AAR CSS is never changed by Extension Mobility.
In a traditional CSS approach, the same CSS is used, causing problems with users’ CoS in multisite deployments.
