3Com 3C10402B, Руководство администратора

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298 C
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information would be meaningless to someone outside the system. For
hop-off calls, you can create a separate pretranslator.
VTL Calls, Caller ID and Hop Off
If a VTL call from System A to System B hops off System B and onto an
ISDN PRI trunk, the “*” characters in the caller ID string can present
problems for the PRI service. The PRI service cannot interpret the “*”
symbols so it ignores the caller ID string it has received and instead uses
the PRI line telephone number. For example, if you must dial
1-508-555-1234 to access the PRI externally, that number is used for the
outgoing caller ID. If System A or System B has CLIR (Calling Line Identity
Restriction) enabled, the PRI service ignores the CLIR setting and it sends
the PRI line telephone number as the caller ID.
If you have a pretranslator on System B that removes the IP address from
the caller ID string of incoming VTL calls, then the caller ID will be the
extension of the telephone making the call. If system A and/or System B
has CLIR enabled, then CLIR will be in effect. The only exception is for
emergency calls (as defined in System B's dial plan), which never have
caller ID blocked.
Figure 14 shows an example of a pretranslator that removes the “*”
character from VTL calls that originate on a system with the IP address
10.234.208.2. The Value column of the PreTranslatorOperation Create
line of
Figure 14 specifies how many digits to strip from the beginning of
the string. That value depends on the length of the received IP address. In
the example, the IP address, 10*234*208*2, is 12 digits, and then you
must also count the trailing “*” in the string. That trailing “*” is the
character that separates the IP address from the caller extension and you
must count it when you specify the number of digits to remove.
Figure 14 Pretranslator to Remove IP Address
PreTranslator Create 2 VTL
/ PreTransId Entry Digits
/ ---------- ----- ------
PreTranslatorEntry Create 2 1 10*234*208*2*
/ PreTransId Entry OperId Operation Value
/ ---------- ----- ------ --------- -----
PreTranslatorOperation Create 2 1 1 stripLead 13