CDR ‐ Call Detail Record

When you make a phone call to another phone number, from the perspective of the LibreSBC, there are 2 parts/legs of the call session:

• Ingress (aka A leg or the incoming call leg) to the LibreSBC is the incoming connection from the originator (caller)
• Egress (aka B leg the outgoing call leg) from the LibreSBC is the outbound connection to the recipient of the call (callee)

Call Detail Records are the data recorded during each call session, each leg will have it own CDR.

Parameter	Description
uuid	CDR uuid, unique per leg
seshid	Session id, unique per call session
direction	Call direction, inbound outbound
sipprofile	SIP profile name where call was engaged
context	Context of sip profile
nodeid	SBC node id where call was processed
intconname	Interconnection name
gateway	Gateway name, available for outbound direction only
user_agent	SIP user agent, derived from SIP user agent header
callid	SIP Call ID, derived from SIP call id header
caller_name	Caller name
caller_number	Caller number
destination_number	Destination number
start_time	epochtime when call was started
answer_time	epochtime when call was answered
progress_time	epochtime when 180 Ringing was process
progress_media_time	epochtime when first media was process (it can be 183 early media or 200 OK)
end_time	epochtime when call was hanged up
duration	call duration in second, end_time - answer_time
sip_network_ip	IP address of interconnection via SIP protocol
sip_network_port	Port number of interconnection via SIP protocol
sip_local_network_add	IP address of SBC via SIP connection
transport	Transport protocol udp tcp tls
remote_media_ip	IP address of interconnection via RTP protocol
remote_media_port	Port number of interconnection via RTP protocol
local_media_ip	IP address of SBC via RTP connection
local_media_port	Port number of SBC via RTP protocol
read_codec	Media codec used by interconnection
write_codec	Media codec used by SBC
rtp_crypto	Media encryption algo used for SRTP
hangup_cause	Cause why call was released
sip_resp_code	SIP final response code, eg: sip:487
disposition	Who hangup the call
status	alias of sip_resp_code

How to measure call metric?

• billable duration = end_time - answer_time (duration)
• waiting time for answering = answer_time - start_time
• waiting time for ringing = progress_time - start_time or progress_media_time - start_time (if progress_time=0)
• if call answered: ringing_duration = answer_time - progress_time or answer_time - progress_media_time (if progress_time=0)
• if call unanswered: ringing_duration = end_time - progress_time or end_time - progress_media_time (if progress_time=0)