Technical information

42
Cisco Unified CallManager 4.2(3) Call Detail Record Definition
OL-10659-01
Call Types
• C—Call to PSTN number, number does not exist (cause 1 = number unavailable).
• D—Call to PSTN, fails because PSTN trunks are out of order (cause 38 = Network Out Of Order).
Short Calls
A short call, with a CdrLogCallsWithZeroDurationFlag set at True and a duration of less than 1 second,
appears as a zero duration call in the CDRs. The DateTimeConnect field, which shows the actual connect
time of the call, differentiates these calls from failed calls. For failed calls (which never connected), this
value equals zero.
The following table contains an example of a successful on-net call with a duration of less than 1 second,
cleared by the called party.
Cisco Unified IP Phone Failure During a Call
When a Cisco Unified IP Phone is unplugged, no immediate physical indication goes to the Cisco
Unified CallManager. The Cisco Unified CallManager relies upon a transmission control protocol
(TCP)-based keepalive signaling mechanism to detect when a Cisco Unified IP Phone becomes
disconnected.
Each Cisco Unified IP Phone sends a keepalive message to the Cisco Unified CallManager at the
configured keepalive interval (default=30 seconds), and the Cisco Unified CallManager responds with
an acknowledgement. Both parties then know that the other is functioning properly. When a Cisco
Unified IP Phone is unplugged, it fails to send this keepalive message. The Cisco Unified CallManager
waits twice the keepalive interval from the time of the last keepalive message before assuming that the
Cisco Unified IP Phone no longer functions.
The implication to billing is that, when a Cisco Unified IP Phone is unplugged, the duration of the call
that is reflected in the CDR can be up to twice the keepalive interval plus the TCP retry timers longer
than the actual speech-time that the user experienced. This worst-case value assumes that the other party
did not hang up.
Identify calls that fail in this manner by a cause value of 41 (Temporary Failure). This cause value can
possibly occur in other circumstances because external devices such as gateways can also generate this
cause value.
Calling
Party
Calling
Partition
Original Called
Party
Original
Called
Partition
Orig
Cause
Dest
Cause
DateTime
Connect Duration
A 2001 Accounts 16 0 0 0
B 2001 Accounts 902920262226 PSTN 0 17 0 0
C 2001 Accounts 902920100000 PSTN 0 1 0 0
D 2001 Accounts 902920262226 PSTN 0 38 0 0
Calling
Party
Calling
Partition
Original
Called
Party
Original
Called
Partition
Orig
Cause
Dest
Cause
DateTime
Connect Duration
2001 Accounts 2309 Marketing 0 16 973795815 0