Route List : Quick Definition
Route Lists are a method of configuring call routing via a number of Route Groups
Route Group : Quick Definition
Route Groups are prioritized groupings of gateways through which calls can be routed.
Calling Search Space – CSS : Quick Definition
A CSS specifies an ordered list of partitions that a device such as a Cisco IP Phone can call
Partition: Quick Definition
A partition specifies a grouping of Directory Numbers (DNs) .
SIP CUCM
Since Call Manager 4.X, SIP Trunks can be used for connectivity with SIP Networks and devices via a SIP Proxy Servers.
A SIP Proxy can handle SIP Request , Authentication and Authorization of users and will implement policies and features
Connection Monitor Duration
Connection Monitor Duration is the lenght of time before a phone which is using SRST fails back to a Call Manager after it has become available again.
The default value is 120 seconds. So if you want that your SRST phones re-homes quicker after a failover, then you have to decrease this timeout.
See also this post about SRST