350-801 · Question #154
Refer to the exhibit. What is the result of applying these two rules to a voice translation-profile for use with an ISDT1 PRI on a Cisco Voice gateway?
The correct answer is A. The ISDN Type is modified to the administrators defined value. Applying these voice translation rules to an ISDN PRI on a Cisco Voice Gateway modifies the ISDN number type from whatever it is initially to 'international', indicated by the '+E.164' pattern. The first rule adds the '+E.164' prefix, which signifies international numbering…
Question
Refer to the exhibit. What is the result of applying these two rules to a voice translation-profile for use with an ISDT1 PRI on a Cisco Voice gateway?
Options
- AThe ISDN Type is modified to the administrators defined value.
- BThe ISDN Plan is modified to the administrators defined value.
- CThe leading Plus is stripped from the numeric phone number.
- DAny Zero is stripped from the numeric phone number.
How the community answered
(55 responses)- A78% (43)
- B4% (2)
- C5% (3)
- D13% (7)
Why each option
Applying these voice translation rules to an ISDN PRI on a Cisco Voice Gateway modifies the ISDN number type from whatever it is initially to 'international', indicated by the '+E.164' pattern. The first rule adds the '+E.164' prefix, which signifies international numbering type, and the second rule then removes the literal '+' while preserving the E.164 type.
Rule 1 matches any number (represented by `.`) and replaces the entire number with `+E.164`. The `+` in `+E.164` signifies that the Number Type should be treated as "International" in ISDN messaging. Rule 2 then takes the `+E.164` string and replaces it with `E.164`, effectively setting the number type to international while removing the literal `+` character from the dialed string itself, which is typically used by Call Managers. This combination manipulates the Numbering Type/Plan within the ISDN setup message rather than just the digits.
While ISDN Plan can be modified, the `+E.164` and `E.164` patterns are primarily indicative of Number Type (International) and Numbering Plan (E.164), rather than only the Plan.
The leading plus is initially added by rule 1 (as part of `+E.164`) and then immediately stripped by rule 2. The primary effect is not just stripping a plus, but setting the ISDN Number Type to International.
There is no rule shown that targets or strips a leading zero from the numeric phone number.
Concept tested: Voice translation-rules for ISDN Number Type
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/vcr1/vcr1-cr-book/vcr1-cr-vtr.html
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