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Term Definitions

What is Average Call Duration (ACD)?

Average Call Duration measures the average length of time a call remains connected.
 
What is Post Dial Delay (PDD)?
Post Dial Delay measures the amount of time after the user dials a phone number till the time the user hears a ring-back tone.
 
What is the bandwidth consumption for each codec?
 
                   

Codec Information

Bandwidth Calculations

Codec & Bit Rate (Kbps)

Codec Sample Size (Bytes)

Codec Sample Interval (ms)

Mean Opinion Score (MOS)

Voice Payload Size (Bytes)

Voice Payload Size (ms)

Packets Per Second (PPS)

Bandwidth MP or FRF.12 (Kbps)

Bandwidth w/cRTP MP or FRF.12 (Kbps)

Bandwidth Ethernet (Kbps)

G.711 (64 Kbps)

80 Bytes

10 ms

4.1

160 Bytes

20 ms

50

82.8 Kbps

67.6 Kbps

87.2 Kbps

G.729 (8 Kbps)

10 Bytes

10 ms

3.92

20 Bytes

20 ms

50

26.8 Kbps

11.6 Kbps

31.2 Kbps

G.723.1 (6.3 Kbps)

24 Bytes

30 ms

3.9

24 Bytes

30 ms

33.3

18.9 Kbps

8.8 Kbps

21.9 Kbps

G.723.1 (5.3 Kbps)

20 Bytes

30 ms

3.8

20 Bytes

30 ms

33.3

17.9 Kbps

7.7 Kbps

20.8 Kbps

G.726 (32 Kbps)

20 Bytes

5 ms

3.85

80 Bytes

20 ms

50

50.8 Kbps

35.6 Kbps

55.2 Kbps

G.726 (24 Kbps)

15 Bytes

5 ms

 

60 Bytes

20 ms

50

42.8 Kbps

27.6 Kbps

47.2 Kbps

G.728 (16 Kbps)

10 Bytes

5 ms

3.61

60 Bytes

30 ms

33.3

28.5 Kbps

18.4 Kbps

31.5 Kbps

G722_64k(64 Kbps)

80 Bytes

10 ms

4.13

160 Bytes

20 ms

50

82.8 Kbps

67.6Kbps

87.2 Kbps

ilbc_mode_20(15.2Kbps)

38 Bytes

20 ms

NA

38 Bytes

20 ms

50

34.0Kbps

18.8 Kbps

38.4Kbps

ilbc_mode_30(13.33Kbps)

50 Bytes

30 ms

NA

50 Bytes

30 ms

33.3

25.867 Kbps

15.73Kbps

28.8 Kbps

 

 
 
What are SIP Methods / Requests and Responses?
SIP uses Methods / Requests and corresponding Responses to establish a call session.
SIP Requests:
There are six basic request / method types:

INVITE = Establishes a session
ACK = Confirms an INVITE request
BYE = Ends a session
CANCEL = Cancels establishing of a session
REGISTER = Communicates user location (host name, IP)
OPTIONS = Communicates information about the capabilities of the calling and receiving SIP phones

SIP responses:
SIP Requests are answered with SIP responses, of which there are 6 classes:
1xx = informational responses, such as 180, which means ringing
2xx = success responses
3xx = redirection responses
4xx = request failures
5xx = server errors
6xx = global failures

 
What is a SIP-URI?
A SIP URI is the SIP addressing schema to call another person via SIP. In other words, a SIP URI is a user’s SIP phone number. The SIP URI resembles an e-mail address and is written in the following format:
SIP URI = sip:x@y:port    Where x=Username and y=host (domain or IP) port= #
Examples:
sip:joe.bloggs@212.123.1.213:5060
sip:support@phonesystem.3cx.com:5060
sip:22444032@phonesystem.3cx.com:5060

The SIP URI standard has been defined in the RFC 3261 standard.
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