SBC session border controllers 67
Example: 45+ — strings that contain the sequence: 45, 455 etc;
Example: ^2.+ — a string that begins with two and continues with one or more of any number of characters.
9. Curly braces may indicate the exact range of character repetitions:
– {k, m} — repetition of the previous character from k to m times;
– {k,} — repetition of a character k times or more;
– {,m} — repetition of a character no more than m times;
– {n} — repetition of a character exactly n times. It is similar to {n,n}.
Example: ^7{0,1}38329[0-5][0-9]{4}$ — any line that does or does not contain a seven at the beginning, then
the sequence 38329, followed by one any digit from zero to five, followed by four any digits.
10. Expressions can be grouped together in parentheses. Usually used with the symbol "|" (vertical slash),
which stands for logical OR;
Example: (^9000$|^10000$) — a string corresponds to 9000 or 10000;
Example: ^(7|8)[0-9]{10}$ — a string starts with a seven or eight and then contains 10 digits;
Example: ^(4[0-4]|5[3-4]) — a string that starts with 40, 41, 42, 43, 44, 53 or 54.
11. To match special characters used in a regular expression, escape them with a "\" (backslash).
Example: ^\+7.* — a string that starts with +7.
4.1.3.6 RTP ports range
In this section, you may configure UDP port range for voice RTP packets transmission. It is possible to specify
from 1 to 32000 ports.
SBC Configuration –> RTP ports range
UDP ports settings for RTP
– Starting port — the number of the initial UDP port used for trans-
mitting voice traffic (RTP) and data using the T.38 protocol;
– Ports count — the range (number) of UDP ports used for transmit-
ting voice traffic (RTP) and T.38 data.
To avoid collisions, the ports used for RTP and T.38 transmission must not overlap with the
ports used for SIP signalling (default port 5060).
4.1.3.7 SIP statistics
This section configures the display and structure of groups of statistics. Any group can be hidden from the
«Monitoring - SIP statistics» menu. In groups 8 to 11 inclusive, you can configure the SIP response codes to be
counted in them and the name of the counters to be displayed.
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