[OpenSIPS-Users] missing from user 500 Internal Server Error

[Kneeoh]

Can someone tell me if this is illegal per RFC and if so where the language is?
From: <sip:20.32.34.55:5063>
Opensips is kicking out a 500 Internal Server Error and the following in the logs:
ERROR:core:parse_from_header: bad from header 
ERROR:dialog:pre_match_parse: failed to get From header

I"d like to either fix it with some Opensips magic, (like ignore from and just pass the call) or point the originator to the right documentation to go fix their switch.
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