User manual

99
Carrier Misidentifications: Occasionally during the beginning and end of a sweep with multiple modems,
some Carrier lines will misidentify as voice lines if two modems attempt to call the same number at the
same time.
10.1.4 Fax/Modem Line Sweep Results
Connect Identify Brute-force Line Type Connect Identify
Call Type NO SCD w/ SCD NO SCD w/ SCD NO SCD w/ SCD
Fax & Carrier
1
st
Call
Carrier Fax Carrier, System
if Identified
Fax
Carrier,
Username/
Password
Fax
2
nd
Call
Fax Carrier Fax Carrier, System
if Identified
Fax Carrier,
Username/
Password
Fax only
Fax Fax Fax Fax Fax Fax
Modem only
Carrier Carrier Carrier, System
if Identified
Carrier, System
if Identified
Carrier,
Username/
Password
Carrier,
Username/
Password
10.1.5 Second Dial-tone Sweep Results
Connect Identify Brute-force Line Type Connect Identify
Call Type NO SCD w/ SCD NO SCD w/ SCD NO SCD w/ SCD
Fax & Carrier
1
st
Call
Timeout Tone Timeout Tone Timeout Tone
2
nd
Call
NO_Facsimile None NO_Facsimile None NO_Facsimile None
Fax only
NO_Facsimile NO_Facsimile NO_Facsimile NO_Facsimile NO_Facsimile NO_Facsimile
Modem only
Timeout Timeout Timeout Timeout Timeout Timeout
Misidentifications can happen for second Dial-tones. This is largely a result of the modem’s interpretation
of certain sounds: certain types of rings and line noise can cause the modem to think there is a second
dial-tone after initial call pick up. When this occurs, further investigation must be done by hand
(telecommunications personnel) in order to verify whether a given line has been misidentified or if the
line has been compromised.
Currently, certain results do not report as anomalies in the PhoneSweep Report. They are:
• Fax/Busy: Lines were identified as Fax lines, but were busy when PhoneSweep tried to test them
as being carrier (modem) too).
• Voice/timeout: Two modems attempted to call the same number close together in time.
10.2 Characteristics of telephone systems that can affect
the results of a scan
Telephone switching systems often differ in subtle ways that can affect the results of your scan and how
some categories of detection results should be interpreted. Therefore, you should be aware of both how
your particular phone system operates and various ways in which a phone system can affect your scan or
even give incorrect results. Understanding how your phone switch works helps interpret the results of
your scan and also aids in troubleshooting any problems that may arise during a scan.