I just pushed an updated version.

I made some assumptions (also noted as comments):

1. When parsing the FROM body, all leading whitespace up to < are removed when there is no Display Name.
2. We are modifying a valid SIP message (otherwise parser has already failed beforehand). Therefore, we can check confidently, if there is < at the start of the FROM body, the URI is enclosed in < >.

If this is not enough, we can always check the FROM body, if it contains < followed by >.

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