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GSM 03.38 substitution character?

I am formatting the GSM 03.38 conversion table [1] into ICU .ucm file
format. The one piece of information that I am missing is the
substitution character. Is there an official one defined?

0x1A is not available because it's mapped to a graphic character. I
have 0x3F ('?') in my draft .ucm table.

(I don't see any charset registration with "gsm" from which I could
glean this information. And this is not a registration request.)

Thanks,
markus

[1] http://www.unicode.org/Public/MAPPINGS/ETSI/GSM0338.TXT