Expected phone number format not well-specified

[joepie91]

From here:

"identifier": {
  "type": "m.id.phone",
  "country": "<The country that the phone number is from>",
  "phone": "<The phone number>"
}

The specification does not define exactly what format the country field should have - should it be a country calling code, an ISO-3166 country code, or something else entirely?

It also doesn't specify what format the phone field should have, although I assume that it's expecting the phone number formatted as a local number.

Edit: To be clear, this is not about third-party identifiers with the msisdn medium, but about m.id.phone-type user identifiers.

[uhoreg]

From the Riot code, it looks like it's ISO-3166-1 alpha-2 code. @dbkr can you confirm?

[turt2live]

ISO-3166-1 alpha-2 code looks right to me.