Hi,
From SRST Q&A:
Q. Does Cisco Unified SRST support Extension Mobility?
A. Cisco Unified SRST routers do not support Extension Mobility. IP phones rely on the support from Cisco Unified Communications Manager for Extension Mobility support. When in SRST mode, IP phones fall back to the SRST router with whatever profile it contains (extension#, .., etc.).
Hope to help, if it does please rate.
Best regards,
- Adrián.
