diff --git a/src/isup.hrl b/src/isup.hrl
new file mode 100644
index 0000000..fc6bd32
--- /dev/null
+++ b/src/isup.hrl
@@ -0,0 +1,53 @@
+% Table 1 / Q.762 - ISDN user part message acronyms
+
+-define(ISUP_MSGT_ACM).	%  Address complete
+-define(ISUP_MSGT_ANM).	%  Answer
+-define(ISUP_MSGT_APM).	%  Application transport
+-define(ISUP_MSGT_BLA).	%  Blocking acknowledgement
+-define(ISUP_MSGT_BLO).	%  Blocking
+-define(ISUP_MSGT_CCR).	%  Continuity check request
+-define(ISUP_MSGT_CFN).	%  Confusion
+-define(ISUP_MSGT_CGB).	%  Circuit group blocking
+-define(ISUP_MSGT_CGBA).%  Circuit group blocking acknowledgement
+-define(ISUP_MSGT_CGU).	%  Circuit group unblocking
+-define(ISUP_MSGT_CGUA).%  Circuit group unblocking acknowledgement
+-define(ISUP_MSGT_CON).	%  Connect
+-define(ISUP_MSGT_COT).	%  Continuity
+-define(ISUP_MSGT_CPG).	%  Call progress
+-define(ISUP_MSGT_CRG).	%  Charge information
+-define(ISUP_MSGT_CQM).	%  Circuit group query
+-define(ISUP_MSGT_CQR).	%  Circuit group query response
+-define(ISUP_MSGT_DRS).	%  Delayed release (reserved – used in 1988 version)
+-define(ISUP_MSGT_FAA).	%  Facility accepted
+-define(ISUP_MSGT_FAC).	%  Facility
+-define(ISUP_MSGT_FAR).	%  Facility request
+-define(ISUP_MSGT_FOT).	%  Forward transfer
+-define(ISUP_MSGT_FRJ).	%  Facility reject
+-define(ISUP_MSGT_GRA).	%  Circuit group reset acknowledgement
+-define(ISUP_MSGT_GRS).	%  Circuit group reset
+-define(ISUP_MSGT_IAM).	%  Initial address
+-define(ISUP_MSGT_IDR).	%  Identification request
+-define(ISUP_MSGT_IRS).	%  Identification response
+-define(ISUP_MSGT_INF).	%  Information
+-define(ISUP_MSGT_INR).	%  Information request
+-define(ISUP_MSGT_LPA).	%  Loop back acknowledgement
+-define(ISUP_MSGT_LOP).	%  Loop prevention
+-define(ISUP_MSGT_NRM).	%  Network resource management
+-define(ISUP_MSGT_OLM).	%  Overload
+-define(ISUP_MSGT_PAM).	%  Pass-along
+-define(ISUP_MSGT_PRI).	%  Pre-release information
+-define(ISUP_MSGT_REL).	%  Release
+-define(ISUP_MSGT_RES).	%  Resume
+-define(ISUP_MSGT_RLC).	%  Release complete
+-define(ISUP_MSGT_RSC).	%  Reset circuit
+-define(ISUP_MSGT_SAM).	%  Subsequent address
+-define(ISUP_MSGT_SDM).	%  Subsequent directory number
+-define(ISUP_MSGT_SGM).	%  Segmentation
+-define(ISUP_MSGT_SUS).	%  Suspend
+-define(ISUP_MSGT_UBL).	%  Unblocking
+-define(ISUP_MSGT_UBA).	%  Unblocking acknowledgement
+-define(ISUP_MSGT_UCIC).%  Unequipped circuit identification code
+-define(ISUP_MSGT_UPA).	%  User part available
+-define(ISUP_MSGT_UPT).	%  User part test
+-define(ISUP_MSGT_USR).	%  User-to-user information
+