/etc/opensips/dictionary.opensips is in opensips-radius-modules 2.2.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# $Id$
#
# SIP RADIUS attributes
#
# Proprietary indicates an attribute that hasn't
# been standardized
#
#
# NOTE: All standard (IANA registered) attributes are 
#       defined in the default dictionary of the 
#       radiusclient-ng library.
#
#### Attributes ###
ATTRIBUTE Sip-Uri-User         208  string     # Proprietary, auth_radius
ATTRIBUTE Sip-Group            211  string     # Proprietary, group_radius
ATTRIBUTE Sip-Rpid             213  string     # Proprietary, auth_radius
ATTRIBUTE SIP-AVP              225  string     # Proprietary, avp_radius
ATTRIBUTE Sip-Call-Duration    227  integer
ATTRIBUTE Sip-Call-Setuptime   228  integer
ATTRIBUTE Sip-Call-Created     229  integer
ATTRIBUTE Sip-Call-MSDuration  230  integer
### Service-Type Values ###
VALUE Service-Type       Group-Check      12   # Proprietary, group_radius
VALUE Service-Type       SIP-Caller-AVPs  30   # Proprietary, avp_radius
VALUE Service-Type       SIP-Callee-AVPs  31   # Proprietary, avp_radius
### Sip-Method Values ###
VALUE Sip-Method         Undefined      0
VALUE Sip-Method         Invite         1
VALUE Sip-Method         Cancel         2
VALUE Sip-Method         Ack            4
VALUE Sip-Method         Bye            8
VALUE Sip-Method         Info           16
VALUE Sip-Method         Options        32
VALUE Sip-Method         Update         64
VALUE Sip-Method         Register       128
VALUE Sip-Method         Message        256
VALUE Sip-Method         Subscribe      512
VALUE Sip-Method         Notify         1024
VALUE Sip-Method         Prack          2048
VALUE Sip-Method         Refer          4096
VALUE Sip-Method         Other          8192
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