Acronyms and Definitions

ConnexCS uses standard telephony terminology in our Control Panel and documentation.

Find below the definitions for the most relevant telephony terms, along with some general networking terms and ConnexCS specific terms.

Term	Definition	Explanation
ACD	Average Call Duration	The average length of calls. ACD can be a marker of how efficient phone systems are at solving problems instantly.
ALOC	Average Length of Call	See ACD.
ASR	Answer-Seisure Ratio	The call answer rates as a percentage (connected calls divided by total calls).
Channel	n/a	An ongoing live call on the system.
CLI	Calling Line Identification	Identifies the caller's telephone number, which is often displayed to the call recipient in the form of Caller-ID.
CPS	Calls Per Second	The volume of calls, referred to the number of calls handled per second, rather than the number of calls a system can receive.
CDR	Call Detail Records	In-depth information about calls that pass through a VoIP exchange. CDRs are a source data for billing and consumer tracking.
Codec	Coder-Decoder	Encodes and decodes data between analog and digital signals, with some form of compression.
DID	Direct Inward Dial	By assigning a public number to an internal location, outside callers can reach a destination without going through a PBX.
DTMF	Dual-Tone Multi-Frequency	A signalling system that connects points in the telephony network, typically between telephone equipment, communications devices, and switching centers. See Wikipedia DTMF for more details.
E.123	Specific Number Format	A standard that includes a number format beginning with a + followed by a country code and subscriber number.
E.164	Specific Number Format	As described by the ITU, the E.164 general format must contain only digits split as follows: Country code (1 to 3 digits) Subscriber number (max 12 digits).
FAS	False Answer Supervision	A kind of billing fraud, it bills a call for a length of time that was longer than the actual call duration.
Flow Speed	n/a	The number of allowed calls per second. ConnexCS uses this term and Calls Per Second (CPS) interchangeably.
FQDN	Fully Qualified Domain Name	A domain name, which also includes a hostname, that points to or references an IP. For example, sip.connexcs.com.
IVR	Interactive Voice Response	Sometimes known as a "phone tree," this allows callers to select different options that connect them to different end-points (For example, extensions or users) in your system.
Jitter	n/a	This refers to the variation in time between received packets. In a VoIP system, Jitter may explain voice quality issues such as robotic-sounding voices, static, or choppy audio.
LCR	Least-Cost Route	The practice of managing traffic in a VoIP network in the least expensive way. 'Expensive' can relate to the actual cost, or it can abstractly refer to time and effort.
LRN	Location Routing Number	Wikipedia LRN. A number portability system used to route NPA-NXX calls and allow the receiving carrier to find the price of the call, not the destination number.
MOS	Mean Opinion Score	This score can show the general call quality of a system, a carrier, or a customer.
NAT	Network Address Translation	This is a networking practice that allows private IPs in a defined network to share a public IP that can route over the internet, helping to conserve the dwindling supply of public IPs.
NER	Network Effectiveness Ratio	Measures a network's ability to deliver phone calls independent of user actions like a terminal reject.
NPA-NXX	Numbering Plan Area-1st 3 digits	The number is followed by four more identifying digits, making it NPA-NXX-XXXX. The 'N' in NXX is different because it represents digits from 2 9 instead of 0–9, as it's with 'X'. See USA Routing for further explanation.
P-Asserted-ID	n/a	A header field in the SIP INVITE that has the identity of the caller (typically used for caller-ID).
PDD	Post-Dial Delay	The time between the last digit dialled and a ringer or equal action on the other end. This is useful to check to see if a carrier is slow to connect a call.
PSTN	Public Switched Telephone Network	A broad term that encompasses most telephone networks, including telephone lines, mobile networks, and communication satellites.
RTP	Real-time Transfer Protocol	A network protocol used to move media across IP-based systems.
SIP	Session Initiation Protocol	A TCP/IP-based network protocol used in VoIP telephony to establish connections for telephone calls.
SIP Trace	n/a	A log of SIP signalling messages, this is an essential tool for troubleshooting registration, call completion, and other issues.
Transcoding	n/a	Converts file from one format to another. In ConnexCS, this refers to the process of converting audio from one codec to another, often when there is low-bandwidth.