Does UC500 supports SRST?
I have a cental site using call manager and a remote site using UC500.C
an I enable srst feature?
Sadly the UC500 Series does not support SRST functionality :(
Q. Does the Cisco Unified Communications 500 Series support Survivable Remote Site Telephony (SRST)?
A. No, the Cisco Unified Communications 500 Series is a new platform designed for small businesses and supports standalone deployments. Cisco offers the integrated services router portfolio for deployments requiring interoperability with Cisco Unified Communications Manager and/or SRST functions. The Cisco Unified Communications 500 Series is meant for distributed voice deployments.
From this good Q&A doc;
Hope this helps!