Base Doc: replace telephone with phone in examples and supporting explanations

[kayaelle]

Telephone was replaced by phone:PhoneNumber but telephone is still mentioned in some places in the doc:

2.3.3: "Email and telephone number based recipient identifier authentication are up to the relying party..."

6.2.4: "The resource server MAY respond with 400 BAD_REQUEST to reject data that is known immediately to not be acceptable by the platform, e.g. to reject a "telephone" property if the resource server cannot validate telephone numbers."

6.2.4 Example 12

[ottonomy]

In the context

"phone": {
          "@id": "https://purl.imsglobal.org/spec/vc/ob/vocab.html#PhoneNumber",
          "@type": "xsd:string"
        },

The IRI for phone is a little odd, as it refers to the same IRI as the type PhoneNumber. What is the intentionality behind the change from schema:telephone to an OB-scoped phone property?

[ottonomy]

The OB 2.0 spec required that the phone number be in E.164 format, but the 3.0 spec is less specific about how the string "representing a phone number" should be formatted. See phone.

Do we want to lose this specificity?