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Cisco Media Gateway Controller Software Release 9 Billing Interface Guide
OL-1089-11
Chapter 1 Billing Interfaces
Cisco MGC Clock Synchronization
If a call was stable during the failover, then the newly active Cisco MGC eventually generates an end of
a call CDB (Release CDB or possibly an Interrupted CDB) for each call. The CDBs generated by the
previous standby MGC include the same unique Call IDs. The mediation software requires correlating
the CDB records from both systems. For both systems to be properly correlated, both Cisco MGC clocks
must be synchronized with each other.
Cisco MGC Clock Synchronization
The Cisco MGC uses Network Time Protocol (NTP) to synchronize its time to another server or
reference time source, such as a radio or satellite receiver or modem. For example, the NTP provides
client accuracy that is typically within 1 millisecond on LANs and up to a few tenths of a second on
WANs relative to a primary server synchronized to Coordinated Universal Time (UTC) by a Global
Positioning Service (GPS) receiver. To achieve high accuracy and reliability, typical NTP configurations
use multiple redundant servers and diverse network paths. Some configurations include cryptographic
authentication to prevent accidents or malicious protocol attacks.
Note RFC-1305 provides information on the NTP architecture, protocol, and algorithm.
Detailed CDB Description
This section contains the distinct record layouts for the CDB. Since each type of CDB is for a different
part of a call, the Cisco MGC provides the related CDEs that are needed.
Note The CDE includes only fields that have values. The layout varies based on the Cisco MGC configuration.
For example, if the Cisco MGC is configured with a protocol that does not support a specific CDE, then
the CDB record does not include that particular CDE.
Answered CDB Record (Tag: 1010/Release 5 or Later)
Table 1-6 lists data about the answered message. This CDB is generated when a call went through and
was answered (when the Cisco MGC receives ANM/Answered message).
Table 1-6 Answered CDB Record
Field Name
Tag
Value Comments
ANSI Based Formatted Fields
When configured for ANSI-based formatted
fields (Release 7 or later option)
Calling Party Category 2000
User Service Information 2001
Originating Line Information 2002
Calling Number Nature of Address 2003
Charged Number Nature of Address 2004