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
Device Pool
A Device Pool is a simple method of configuring the same parameters for a set of devices.Once you assign a device to a Device Pool, it inherits those parameters configured for the Device Pool. The seven mandatory settings are :
- Call Manager Group
- Date/Time Group
- Region
- Softkey Template
- SRST Reference
- MLPP Indication
- MLPP Preemption
Call Manager Groups
Cisco Call Manager groups can be used to specify a prioritized list of up to three Call Manager with which Cisco IP Phones can register. You assign a Call Manager to a device through a Device Pool
During a failover transition , active calls are preserved and phones will re-register once the existing calls are complete.
Regions
You use Regions to specify the codec and the maximum video bandwidth that can be used on calls between devices .
Every device is in one Region, and you assign a device to a Region by specifying a Region within a Device Pool and then assigning a Device Pool to a device
MGCP Called ID on FXS ports
Caller ID is not supported on MGCP Controlled FXS ports.
So remind this if you need it 🙂