3.1.5.21.5 ice-ufrag and ice-pwd attributes

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According to [IETFDRAFT-ICENAT-19], the ice-ufrag attribute can be 4 to 256 bytes long and the ice-pwd attribute can be 22 to 256 bytes long, and they are in plaintext. This protocol determines if base64 encoding is used in the offer by checking their lengths. Therefore, so that the answering agent does not treat plaintext as an encoded string, this protocol SHOULD NOT<41> use an ice-ufrag attribute of 6 bytes and an ice-pwd attribute of 32 bytes long in an offer.