_____________________________ CRA-200 Quick Installation Guide
___________________________________________________________________________________________________________________
Page: 6 of 7
to the device’s LAN port). Therefore, it is important that you
consider the number of total phone lines you will be attaching to
each CRA‐200 device in addition to the two lines that are already
available. In the sample configuration shown below, where you
have one CRA‐200 box with VPN enabled and two additional
Internet phone devices for a total of 4 phone lines, a 128 Kbps
Internet connection will allow for no more than 4 simultaneous
phone calls at a given time when using codec G.729/ Latency
Configuration of 60ms (see page 10 for a brief explanation of
Codec Latency Configuration
).
Recommended
Number
of
Simultaneous
Calls
The following chart depicts a general guideline range for the
recommended maximum number of simultaneous calls when
VPN capability is enabled for each codec/Latency configuration.
The amount of allowable simultaneous phone calls and its call
quality are directly related to bandwidth availability and its
utilization.
DSL
Speed
729 90ms
729 60ms
729 30ms
128k
4-6 max.
calls
4-5 max.
calls
2-3 max. calls
256k
10-12
8-10
5-6
384k
17-19
13-15
8-9
512k
23-25
18-20
11-13
768k
36-38
28-30
17-19
1024k
48-51
38-40
23-26
DSL
Speed
723 90ms
723 60ms
723 30ms
128k
5-7
4-5
2-3
256k
12-14
9-11
5-6
384k
18-20
15-17
8-9
512k
26-28
20-22
11-13
768k
41-43
32-34
17-19
1024k
56-58
43-45
23-26
