/usr/share/freeradius/dictionary.openser is in freeradius-common 2.1.12+dfsg-1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | # -*- text -*-
##############################################################################
#
#	OpenSER dictionary.
#
#	This dictionary is NOT included by default, because it conflicts
#	with attributes defined in the RADIUS standard.  Vendors SHOULD
#	be using a VSA space to assign attributes.
#
#	Be aware that if you DO include this dictionary in the main
#	dictionary file, other parts of your configuration may break!
#
#	http://www.openser.org/docs/openser-radius-1.0.x.html
#
#	$Id$
#
##############################################################################
ATTRIBUTE	Sip-Method				101	integer
ATTRIBUTE	Sip-Response-Code			102	integer
ATTRIBUTE	Sip-Cseq				103	string
ATTRIBUTE	Sip-To-Tag				104	string
ATTRIBUTE	Sip-From-Tag				105	string
ATTRIBUTE	Sip-Translated-Request-URI		107	string
ATTRIBUTE	Sip-Src-IP				108	string
ATTRIBUTE	Sip-Src-Port				109	string
ATTRIBUTE	Sip-Uri-User				208	string
ATTRIBUTE	Sip-Group				211	string
ATTRIBUTE	Sip-Rpid				213	string
ATTRIBUTE	SIP-AVP					225	string
VALUE	Service-Type			Group-Check		12
VALUE	Service-Type			Sip-Session		15
VALUE	Service-Type			SIP-Caller-AVPs		30
VALUE	Service-Type			SIP-Callee-AVPs		31
VALUE	Sip-Method			INVITE			1
VALUE	Sip-Method			CANCEL			2
VALUE	Sip-Method			ACK			4
VALUE	Sip-Method			BYE			8
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