Which option describes a function of SIP preconditions?
A. SIP preconditions enable end-to-end RSVP over an SIP trunk.
B. SIP preconditions enable RSVP between Cisco IP Phones.
C. SIP preconditions can be enabled in a gatekeeper.
D. SIP preconditions enable end-to-end RSVP for calls through the PSTN.
SVP SIP Preconditions has two modes of configuration, local RSVP and end-to-end RSVP. These modes are configured on the SIP Trunk Profile in Unified CM administration pages.