diff --git a/pymetaverse/const.py b/pymetaverse/const.py
index 463053d..6d5d426 100644
--- a/pymetaverse/const.py
+++ b/pymetaverse/const.py
@@ -51,4 +51,127 @@ AGENT_CONTROL_AWAY              = 0x08000000
 AGENT_CONTROL_LBUTTON_DOWN      = 0x10000000
 AGENT_CONTROL_LBUTTON_UP        = 0x20000000
 AGENT_CONTROL_ML_LBUTTON_DOWN   = 0x40000000
-AGENT_CONTROL_ML_LBUTTON_UP     = 0x80000000
\ No newline at end of file
+AGENT_CONTROL_ML_LBUTTON_UP     = 0x80000000
+
+
+# llmessage/llinstantmessage.h
+
+# default. ID is meaningless, nothing in the binary bucket.
+IM_NOTHING_SPECIAL = 0
+
+# pops a messagebox with a single OK button
+IM_MESSAGEBOX = 1
+
+# pops a countdown messagebox with a single OK button
+IM_MESSAGEBOX_COUNTDOWN = 2
+
+# You've been invited to join a group.
+# ID is the group id.
+
+# The binary bucket contains a null terminated string
+# representation of the officer/member status and join cost for
+# the invitee. (bug # 7672) The format is 1 byte for
+# officer/member (O for officer, M for member), and as many bytes
+# as necessary for cost.
+IM_GROUP_INVITATION = 3
+
+# Inventory offer.
+# ID is the transaction id
+# Binary bucket is a list of inventory uuid and type.
+IM_INVENTORY_OFFERED = 4
+IM_INVENTORY_ACCEPTED = 5
+IM_INVENTORY_DECLINED = 6
+
+# Group vote
+# Name is name of person who called vote.
+# ID is vote ID used for internal tracking
+# TODO: _DEPRECATED suffix as part of vote removal - DEV-24856
+IM_GROUP_VOTE = 7
+
+# Group message
+# This means that the message is meant for everyone in the
+# agent's group. This will result in a database query to find all
+# participants and start an im session.
+IM_GROUP_MESSAGE_DEPRECATED = 8
+
+# Task inventory offer.
+# ID is the transaction id
+# Binary bucket is a (mostly) complete packed inventory item
+IM_TASK_INVENTORY_OFFERED = 9
+IM_TASK_INVENTORY_ACCEPTED = 10
+IM_TASK_INVENTORY_DECLINED = 11
+
+# Copied as pending, type LL_NOTHING_SPECIAL, for new users
+# used by offline tools
+IM_NEW_USER_DEFAULT = 12
+
+#
+# session based messaging - the way that people usually actually
+# communicate with each other.
+#
+
+# Invite users to a session.
+IM_SESSION_INVITE = 13
+
+IM_SESSION_P2P_INVITE = 14
+
+# start a session with your gruop
+IM_SESSION_GROUP_START = 15
+
+# start a session without a calling card (finder or objects)
+IM_SESSION_CONFERENCE_START = 16
+
+# send a message to a session.
+IM_SESSION_SEND = 17
+
+# leave a session
+IM_SESSION_LEAVE = 18
+
+# an instant message from an object - for differentiation on the
+# viewer, since you can't IM an object yet.
+IM_FROM_TASK = 19
+
+# sent an IM to a do not disturb user, this is the auto response
+IM_DO_NOT_DISTURB_AUTO_RESPONSE = 20
+
+# Shows the message in the console and chat history
+IM_CONSOLE_AND_CHAT_HISTORY = 21
+
+# IM Types used for luring your friends
+IM_LURE_USER = 22
+IM_LURE_ACCEPTED = 23
+IM_LURE_DECLINED = 24
+IM_GODLIKE_LURE_USER = 25
+IM_TELEPORT_REQUEST = 26
+
+# IM that notifie of a new group election.
+# Name is name of person who called vote.
+# ID is election ID used for internal tracking
+IM_GROUP_ELECTION_DEPRECATED = 27
+
+# IM to tell the user to go to an URL. Put a text message in the
+# message field, and put the url with a trailing \0 in the binary
+# bucket.
+IM_GOTO_URL = 28
+
+# a message generated by a script which we don't want to
+# be sent through e-mail.  Similar to IM_FROM_TASK, but
+# it is shown as an alert on the viewer.
+IM_FROM_TASK_AS_ALERT = 31
+
+# IM from group officer to all group members.
+IM_GROUP_NOTICE = 32
+IM_GROUP_NOTICE_INVENTORY_ACCEPTED = 33
+IM_GROUP_NOTICE_INVENTORY_DECLINED = 34
+
+IM_GROUP_INVITATION_ACCEPT = 35
+IM_GROUP_INVITATION_DECLINE = 36
+
+IM_GROUP_NOTICE_REQUESTED = 37
+
+IM_FRIENDSHIP_OFFERED = 38
+IM_FRIENDSHIP_ACCEPTED = 39
+IM_FRIENDSHIP_DECLINED_DEPRECATED = 40
+
+IM_TYPING_START = 41
+IM_TYPING_STOP = 42
\ No newline at end of file