Add some unfinished ISUP decoder routines
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
+