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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…

Voice Gateways and Session Border Controllers

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)
  • A
    78% (43)
  • B
    4% (2)
  • C
    5% (3)
  • D
    13% (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.

AThe ISDN Type is modified to the administrators defined value.Correct

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.

BThe ISDN Plan is modified to the administrators defined value.

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.

CThe leading Plus is stripped from the numeric phone number.

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.

DAny Zero is stripped from the numeric phone number.

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

Topics

#Voice Gateways#ISDN PRI#Translation Rules#ISDN Q.931

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