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Appendix C: Telephone number basics
In the following the general functionalities of call routing are described, followed by a short introduction into
the regular expressions used in the Syntax. The description of the configuration dialog is followed by examples of
use and hints.
C.1: Rule based treatment of inbound calls
The treatment of inbound calls in OfficeMaster Gate is handled via adjustable regular expressions. These regular
expressions are filed in tabular format and can be analyzed regarding the run time with the help of an interpreter.
This presentation at first will appear complicated to an inexperienced administrator. In time and with the help of
the provided examples this should however turn into a highly flexible tool. For every inbound call the following
information is processed.
► Called Party Number (CPN)
The CPN is the number the caller dialed, respectively the part of the number that is received by the ISDN
port.
► Calling Party Number (CGN1) and Calling2 Party Number (CGN2)
CGN1 and CGN2 include the telephone numbers of the caller. In most cases there will only be one Calling
Party Number, the second element then remains empty. The first element can also be empty if the caller
does not submit a number at all. CGN1 and CGN2 are for example used together when receiving land line
SMS. In this case, CGN1 is the telephone number of the sender while the CGN2 is the telephone number
of the SMS center. The analysis of the number included in the CGN2 enables the software to recognize that
the call serves the transmission of a SMS.
► Redirecting Number (RN)
The RN includes the telephone number that was originally dialed by the caller, for which a redirect had
been set up.
Example C.1
From a mobile phone with the telephone number 01520189524 the internal telephone num -
ber 947 (dial through of the participant) is dialed; this participant has programmed a call forwarding
to the Pilot-ID 999 of the voice mail system. The above described errors supply the values listed in
the following table.
Table C.1: Description of the Example
Value Description with example
CPN Called Party Number (CPN) is 999 because of call forwarding.
CGN1 Calling Party Number (CGN1) is the number of the mobile phone
CGN2 usually empty
RN Redirecting Number (RN) is 947, meaning the originally called but fowarded number with
which the voice mail system recognizes to which user the call is assigned
End of Example »