Sometimes buggy UACs send in-b2b-dialog CANCEL without from_tag.
b2b_entities module crashes in dlg.c on line 645:
hash_index = core_hash(&callid, &from_tag, server_hsize);
because from_tag is empty.
I've tested it again. Any packet without from tag or without to header crashes opensips!
Added the fix on SVN trunk, 1.8 and 1.7 .
Thanks for report,
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