[aprssig] Do any APRS-IS servers support the 'u' filter?

[Andrew P.]

Greetings.

Does anybody know if the 'u' (unproto or tocall) filter actually works on the servers presently deployed in Tier 2 of APRS-IS? I'm trying to look for deployments of a specific type of APRS node (specifying that product's tocall), but every time I try specifying a u filter in my login, the APRS-IS servers refuse to let me login.

Does anybody know why?

Andrew Pavlin, KA2DDO
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