This section provides you with conversion information between ANSI (ISUP) and ITU (ISUP).
ANSI (ISUP) to ITU (ISUP)
The ANSI (ISUP) to ITU (ISUP) conversion is the most complex conversion, because these variants are mostly incompatible.
For example:
- The point code format is 24-bit in ANSI while its is 14-bit in ITU
- ANSI does not support the ITU Fast Answer Management with the Connect (CON) message while ITU supports this message type
- Circuit Group Management range is 24 octets while this range in ITU is 32 octets.
These two conversion requirements force the ANSI to ITU converter to keep real-time state information. Parameter conversion is also extensive.
For Signaling Connection Control Part (SCCP), the Called and Calling Party Address parameters are converted according to the new point code (PC) size and the PC and Subsystem Number (SSN) indicator location in the Address Indicator (see Party Address Conversion).
SIO Priority Assignment
The ANSI variant has priority bit defined based on message type. Possible values are 0, 1, 2, and 3.
Priority 0: Blocking Ack. Signal (BLA), Blocking Signal (BLO), Confusion (CFN), Circuit Group Blocking (CGB), Circuit Group Blocking Ack. (CGBA), Circuit Group Unblocking (CGU), Circuit Group Unblocking Ack. (CGUA), Circuit Group Query (CQM), Circuit Group Query Response (CQR), Circuit Group Reset (GRA), Circuit Group Reset (GRS), Initial Address (IAM), Reset Confirm (RSC), Unblocking Ack. (UBA), and Unblocking (UBL)
Priority 1: Address Complete (ACM), Continuity Check (CCR), Continuity (COT), Call Progress (CPG), Facility (FAC), Forward Transfer (FOT), Information (INF), Information Request (INR), Loopback Ack. (LPA), Release (REL), Resume (RES), Suspend (SUS), and Unequipped CIC (UCIC)
Priority 2: Answer (ANM) and Release Complete (RLC)
Priority 3: None
Fast Answer Feature
The Fast Answer call setup is a feature present in both ANSI and ITU networks, but the message sequence responsible is different. In ANSI, a Fast Answer condition is satisfied when a call is setup without an ACM (in other words, the IAM is responded immediately by an ANM). In ITU, the ACM is again excluded but a CON message is sent instead of the ANM. Because the CON message is not supported in ANSI, and an ANM without a prior ACM is not supported in ITU, a call state-based conversion is required for ANSI to ITU conversion. A simpler conversion is defined for ITU to ANSI conversion.
Circuit Group Message Management
The circuit range maximum in ANSI is 24 bits while ITU uses 32 bits. Messages received with an out-of-bound range is discarded.
If an ITU Circuit Group (CG) query message circuit range exceeds the ANSI maximum value, the message must be broken into two messages which together manage to cover the given range while staying in the ANSI available range. The corresponding acknowledgement messages must be reassembled to obtain the proper single acknowledgement message for the original ITU request message. Therefore, the ITU to ANSI conversion breaks down the CG queries while the ANSI to ITU conversion direction manages the acknowledgment reassembly.
In ITU to ANSI, the converter splits a CG message if its Range and Status parameter’s range value exceeds 23; else, the message is passed through. The first resulting message has the first 16 bits while the other message has the remaining bits (maximum of 16 bits). The messages’ CIC value is modified accordingly (original CIC + 16) to properly identify the new split range. Only the CG request messages CGB, CGU, CQM and GRS require verification. The acknowledgement messages CGBA, CGUA, CQR, and GRA are passed through, because no acknowledgement from an ANSI message is divided. On the odd case of an unexpected acknowledgement message, the ANSI switch processes with its own validation.
Because the acknowledgements may be received on a different peer due to load sharing, the pending unification of the acknowledgements notification must be broadcast. Since both resulting ANSI CG messages have the same Signaling Link Selection (SLS), their corresponding acknowledgements are received by the same peer but not necessarily the one which received the original request. Therefore, for increased efficiency, the peer which received the second acknowledgement message is responsible for the unification.
The CG message pending notification with a DPC-OPC-CIC-MT key and original range value is broadcast to all peers. Upon receipt of a notification, the timer of configurable length set to the CG Ack Timer attribute in the Converter Configuration object (see Table General Configuration Screen Attribute Listing and Description) is started to wait for the two acknowledgement messages in the ANSI to ITU conversion direction.
In ANSI to ITU, the converter reassembles the split CG acknowledgement messages CGBA, CGUA, CQR, and GRA. The CGB, CGU, CQM, and GRS are passed through.
If no pending unification is found for a given acknowledgment message, the message is passed through; else, the information is added to the pending acknowledgement response message. When both acknowledgement messages are received, the lifespan timer and pending unification are cleared and the new unified ITU acknowledgement message is forwarded to the ITU network. If the timer expires, the collected information is discarded.
USI TMR Conversion (ANSI to ITU)
The Transmission Medium Requirement (TMR) parameter in the IAM message is mandatory in ITU and must be added based on the ANSI IAM mandatory User Service Information parameter. The TMR is of fixed size one octet. The TMR is not used in the ANSI network. See User Service Information for parameter definition.
USI Information Transfer Capability | TMR Value |
---|
0x00 – speech
| 0x00 – speech
|
0x08 – unrestricted digital information
| 0x02 – 64 kbit/s unrestricted
|
0x09 – restricted digital information
| 0x02 – 64 kbit/s unrestricted
|
0x10 – 3.1 kHz audio
| 0x03 – 3.1 kHz audio
|
0x11 – unrestricted digit information with tones
| 0x02 – 64 kbit/s unrestricted
|
Default | 0x02 – 64 kbit/s unrestricted
|
The ANSI USI is also converted to the ITU variant. If the DPC associated ITU SS7 Variant Route Mapping ITU USI Discard is enabled, the USI is not converter to ITU but simply discarded following TMR generation.
The USI conversion is as follows:
- If the second octet is extended, remove all extensions.
- If there is an octet 2.1 (multi-rate), remove octet.
- If there are no layer protocols, conversion is complete.
- For layer 1, if protocol is set to
0x02
(G.711 u-law), reset to 0x03
(G.711 A-law).
Fast Answer Conversion
A call state flag is kept for each DPC-OPC-CIC combination key. This implementation does not require any call state information distribution as the message sequence under study is always route to the same converter peer except on link failure.
The fast answer flag is managed given the call message sequence and the configurable lifespan Fast Answer Timer attribute defined in the Converter Configuration object. On receipt of an ACM, the flag is set and the timer started. On receipt of ANM, if the flag is set, the ANM is passed through; else, the ANM is converted into a CON message and the flag and timer are reset. On receipt of a REL or a RLC or on timer expiry, the flag and timer are reset.
For efficiency, a fast answer record is created for each OPC-DPC combination possible for the given Route Mapping records in the ANSI and ITU SS7 variants. Each FA record has a table of CIC values (12-bit maximum) which are empty for unused CICs. A lifespan timer pointer is added to the relevant CIC position to enable the fast answer flag.
ANSI to ITU Parameter Definitions
This section provides you with the ANSI to ITU parameter definitions.
Backward Call Indicators
The Backward Call Indicators (BCI) parameter is a two octet value.
The indicators are as follows.
Bit(s) | Description |
---|
BA | Charge indicator |
DC | Called party’s status indicator |
FE | Called party’s category indicator |
HG | End-to-end method indicator |
I | Inter-working indicator |
J | - IAM segmentation indicator (ANSI
- End-to-end information indicator (ITU)
|
K | Integrated Services Digital Network (ISDN) User Part indicator |
L | Holding indicator |
M | ISDN access indicator |
N | Echo control device indicator |
PO | Signaling Connection Control Part (SCCP) method indicator |
Called Party Number
The Called Party Number parameter is a variable length parameter with the following format.
Odd/Even | Nature of Address Indicator |
INN (ITU) Spare (ANSI) | Numbering Plan | Spare (ITU) Reserved (ANSI) |
2nd Address Signal | 1st Address Signal |
|
Filler (if required) | nth Address Signal |
Calling Party Number
The Calling Party Number parameter is a variable length parameter with the following format.
Odd/Even | Nature of Address Indicator |
INN (ITU) Spare (ANSI) | Numbering Plan | Presentation | Screening |
2nd Address Signal | 1st Address Signal |
|
Filler (if required) | nth Address Signal |
Cause Indicators
The Cause Indicator parameter is a variable length parameter with the following format.
Ext | Coding Standard | Spare | Location |
Ext | Cause Value |
Diagnostic(s) if any |
Forward Call Indicators
The Forward Call Indicator parameter is a two octet value.
The indicators are as follows.
Bit(s) | Description |
---|
A | Incoming international call indicator |
CB | End-to-end method indicator |
D | Inter-working indicator |
E | - IAM segmentation indicator (ANSI)
- End-to-end information indicator (ITU)
|
F | ISDN user part indicator |
HG | ISDN user part reference indicator |
I | ISDN access indicator |
KJ | SCCP method indicator |
L | Spare |
PONM | Reserved for national use |
Nature of Connection Indicators
The NCI parameter is a two octet value.
The indicators are as follows.
Bit(s) | Description |
---|
BA | Satellite indicator |
DC | Continuity check indicator |
E | Echo control device indicator |
HGF | Spare |
The User Service Information (USI) parameter is extendable length value.
Ext | Coding Standard | Information Transfer Capability |
Ext | Transfer Mode | Information Transfer Rate |
Ext | Layer Identifier | User Information Layer 1 protocol |
Etc... |
The following table provides the ANSI (ISUP) to ITU (ISUP) message conversion details.
ANSI (ISUP) to ITU (ISUP) Message Conversion (Continued)
Abbrv. | Code (decimal) | Message Type | Action | Description |
---|
IAM | 0x01 – (1)
| Initial Address | PROCESS | USI TMR conversion and parameter processing. |
INR | 0x03 – (3)
| Information Request | PROCESS | Parameter processing. |
INF | 0x04 – (4)
| Information | PROCESS | Parameter processing. |
ACM | 0x06 – (6)
| Address Complete | PROCESS | Fast answer conversion and parameter processing. |
FOT | 0x08 – (8)
| Forward Transfer | DISCARD | Parameter incompatibility of Call Reference Parameter due to point code reference. |
ANM | 0x09 – (9)
| Answer | PROCESS | Fast answer conversion and parameter processing. |
REL | 0x0c – (12)
| Release | PROCESS | Fast answer conversion and parameter processing. |
SUS | 0x0d – (13)
| Suspend | PROCESS | Parameter processing. |
RES | 0x0e – (14)
| Resume | PROCESS | Parameter processing. |
RLC | 0x10 – (16)
| Release Complete | PROCESS | Fast answer conversion and parameter processing. |
CCR | 0x11 – (17)
| Continuity Check Request | PROCESS | Return an LPA (no parameters) to originating switch of Route Mapping ANSI CCR LPA Response is enabled. |
CGBA | 0x1a – (26)
| Circuit Group Blocking Ack. | PROCESS | Circuit Group message management. |
CGUA | 0x1b – (27)
| Circuit Group Unblocking Ack. | PROCESS | Circuit Group message management. |
LPA | 0x24 – (36)
| Loop Back Ack. | PROCESS | If ANSI CCR LAP Response is enabled, discard LPA; else, pass through. |
PAM | 0x28 – (40)
| Pass-along | DISCARD | Not used in cross network. |
GRA | 0x29 – (41)
| Circuit Group Reset Ack. | PROCESS | Circuit Group message management. |
CQR | 0x2b – (43)
| Circuit Group Query Response | PROCESS | Circuit Group message management. |
CPG | 0x2c – (44)
| Call Progress | PROCESS | Parameter processing. |
CRG | 0x31 – (49)
| Charge | DISCARD | National use only, not supported. |
FAC | 0x33 – (51)
| Facility | PROCESS | Parameter processing. |
SGM | 0x38 – (56)
| Segmentation | DISCARD | Not supported in ANSI. |
CRA | 0xe9 – (233)
| Circuit Reservation Ack. | DISCARD | Not supported in ITU. |
CRM | 0xea – (234)
| Circuit Reservation | DISCARD | Not supported in ITU. |
CRV | 0xeb – (235)
| Circuit Validation Response | DISCARD | Not supported in ITU. |
CVT | 0xec – (236)
| Circuit Validation Test | DISCARD | Not supported in ITU. |
EXT | 0xed – (237)
| Exit (Intra -network application only) | DISCARD | Not supported in ITU. |
The following table provides you with ANSI (ISUP) to ITU (ISUP) parameter conversion details.
ANSI (ISUP) to ITU (ISUP) Parameter Conversion (Continued)
Code (decimal) | Parameter Name | Action | Description |
---|
0x01 – (1)
| Call Reference | DISCARD | Point code incompatibility. |
0x03 – (3)
| Access Transport | PROCESS | Discard parameter if message type is INF; else, pass through. |
0x04 – (4)
| Called Party Number | PROCESS | See ANSI to ITU Parameter Definitions for the CLD information Append ST signal if the ANSI SS7 variant IAM CLD ST Support is enabled (recommended). If ITU SS7 variant Route Mapping ITU Country Code is defined, remove the CC specified digits from the signals and set the Nature of Address to 0x03 (national); else, set the Nature of Address to 0x04 (international). If ITU SS7 Variant Route Mapping ITU CLD NOA is enabled, set the Nature of Address to 0x70 (unknown) which would override the CC conversion if defined. |
0x06 – (6)
| Nature of Connection Indicator | PROCESS | See ANSI - ITU Parameter Definitions for the NCI information If the call is digital [(USI) parameter with information transfer capability set to 0x08 , 0x09 , or 0x11 (audio)], set bit E to 1 (Outgoing half echo control decide included). |
0x07 – (7)
| Forward Call Indicators | PROCESS | See ANSI - ITU Parameter Definitions for the FCI and USI information If ITU SS7 Variant Route Mapping ITU FCI International is enabled, set bit A to 1 (incoming international call); else, set bit A to 0 (not an incoming international call). If call is digital [(USI) parameter with information transfer capability set to 0x08 , 0x09 , or 0x11 (audio)], set bits CB to 0 (no end-to-end method available), bit E to 0 (no end-to-end information available), and bits KJ to 0 (no indication). |
0x0a – (10)
| Calling Party Numbers | PROCESS | See ANSI - ITU Parameter Definitions for the CLG information If ITU SS7 Variant Route Mapping ITU Country Code is defined, the Nature of Address is set to 0x04 (international) and the prefix CC of 1 is added. If ITU SS7 Variant Route Mapping ITU CLG NOA is enabled, set the Nature of Address to 0x70 (unknown) which would override the CC conversion if defined. |
0x0b – (11)
| Redirecting Number | PROCESS | Discard parameter if message type is not IAM; else, pass through. |
0x0c – (12)
| Redirection Number | DISCARD | Procedure incompatibility. |
0x0d – (13)
| Connection Request | DISCARD | Point code included, not compatible. |
0x0e – (14)
| Information Request Indicators | PROCESS | Discard parameter if message type is not INR; else, pass through. |
0x0f – (15)
| Information Indicators | PROCESS | Discard parameter if message type is not INF; else, pass through. |
0x11 – (17)
| Backward Call Indicators | PROCESS | See ANSI - ITU Parameter Definitions for the BCI information Set BA to 10 (charge) Set HG to 00 (no end-to-end method available) Set J to 0 (no end-to-end information available) Set PO to 00 (no indication) If M is set to 1 (terminating access ISDN) and DC is not set to 01 (subscriber free), set DC to 00 (no indication) If M is set to 0 (terminating non-ISDN) set N to 1 (incoming half echo control device included) |
0x13 – (19)
| Redirection Information | PROCESS | Discard parameter if message type not IAM; else, pass through. |
0x16 – (22)
| Range and Status | PROCESS | See Circuit Group Message Management |
0x17 – (23)
| Call Modification Indicators | DISCARD | No procedure in either ANSI or ITU. |
0x18 – (24)
| Facility Indicator | DISCARD | No procedure in ANSI. |
0x19 – (25)
| Facility Information Indicators | DISCARD | No procedure in ANSI. |
0x1a – (26)
| Closed User Group Interlock Code | DISCARD | No procedure in ANSI. |
0x1b – (27)
| Index | DISCARD | Not supported in ITU. |
0x1c – (28)
| Closed User Group Check Response Indicators | DISCARD | Not supported in ITU. |
0x1d – (29)
| User Service Information | PROCESS | See USI TMR conversion. |
0x1e – (30)
| Signaling Point Code | DISCARD | Point code incompatibility. |
0x20 – (32)
| User to User Information | DISCARD | Procedure incompatibility. |
0x21 – (33)
| Connected Number | DISCARD | No procedure in ANSI. |
0x23 – (35)
| Transit Network Selection | DISCARD | Procedure incompatibility. |
0x25 – (37)
| Circuit Assignment Map | DISCARD | Reserved in ITU. |
0x26 – (38)
| Circuit State Indicator | PROCESS | Circuit Group message management. |
0x27 – (39)
| Automatic Congestion Level | PROCESS | ACL value 3 is mapped to 2 as value 3 is spare in ITU. |
0x2a – (42)
| User to User Indicators | DISCARD | Procedure Incompatibility. |
0x2f – (47)
| Network Specific Facilities | DISCARD | Procedure Incompatibility. |
0x30 – (48)
| User Service Information Prime | DISCARD | Procedure Incompatibility. |
0x32 – (50)
| Remote Operations | DISCARD | Procedure Incompatibility. |
0x38 – (56)
| Message Compatibility Information | DISCARD | Not supported in ITU. |
0x39 – (57)
| Parameter Compatibility Information | DISCARD | Not supported in ANSI. |
0x3a – (58)
| Precedence | DISCARD | Not supported in ANSI. |
0x3d – (61)
| Hop Counter | DISCARD | Not supported in ITU. |
0x4e – (78)
| Redirect Capability | DISCARD | Not supported in ITU. |
0x5b – (91)
| Network Management Controls | DISCARD | Not supported in ITU. |
0x77 – (119)
| Redirect Counter | DISCARD | Not supported in ITU. |
0x81 – (129)
| Geodetic Location | DISCARD | Not supported in ITU. |
0xc0 – (192)
| Generic Address | PROCESS | Discard parameter if message type is not IAM; else, pass through. |
0xc2 – (194)
| Operator Services Information | DISCARD | Not supported in ITU. |
0xc3 – (195)
| Egress Services Information | DISCARD | Not supported in ITU. |
0xc4 – (196)
| Jurisdiction | DISCARD | Not supported in ITU. |
0xc5 – (197)
| Carrier Identifier | DISCARD | Not supported in ITU. |
0xc6 – (198)
| Business Group | DISCARD | Not supported in ITU. |
0xc7 – (199)
| Generic Name | DISCARD | Not supported in ITU. |
0xe1 – (225)
| Notification Indicators | DISCARD | Not supported in ITU. |
0xe2 – (226)
| Service Activation | DISCARD | Procedure incompatibility. |
0xe3 – (227)
| Transaction Request | DISCARD | Not supported in ITU. |
0xe5 – (229)
| Circuit Group Characteristic Indicators | DISCARD | Not supported in ITU. |
0xe6 – (230)
| Circuit Validation Response | DISCARD | Not supported in ITU. |
0xe7 – (231)
| Outgoing Trunk Group Number | DISCARD | Not supported in ITU. |
0xe8 – (232)
| Circuit Identification Name | DISCARD | Not supported in ITU. |
0xe9 – (233)
| COMMON LANGUAGE Location Identification (CLLI) Code | DISCARD | Not supported in ITU. |
0xea – (234)
| Originating Line Information | DISCARD | Not supported in ITU. |
0xeb – (235)
| Charge Number | DISCARD | Not supported in ITU. |
0xec – (236)
| Service Code Indicator | DISCARD | Not supported in ITU. |
0xed – (237)
| Special Processing Request | DISCARD | Not supported in ITU. |
0xee – (238)
| Carrier Selection Information | DISCARD | Not supported in ITU. |
0xef – (239)
| Network Transport | DISCARD | Not supported in ITU. |
ITU (ISUP) to ANSI (ISUP)
This section provides you with ITU (ISUP) to ANSI (ISUP) information.
USI TMR Conversion (ITU to ANSI)
The Transmission Medium Requirement parameter in is not used in ANSI network but is mandatory in ITU IAM. The TMR will be discarded from the IAM. In its place a User Service Information parameter is mandatory. See User Service Information for parameter definition.
If the USI is not present in the ITU IAM, add the default USI (hex 80 90 a2) to the ANSI IAM.
If the USI is present, the following conversion will apply:
- If the information transfer rate is set to
0x18
(multi-rate) make sure the 3rd octet is present for the rate multiplier. - If there is no layer protocol, conversion is completed.
- For layer 1, if the protocol is set to
0x03
(G.711 A-law), reset to 0x02
(G.711 u-law).
The TMR Prime parameter is converted to a USI Prime in an SS7-IP deployment if fall back USI management is used. Additional information is added if CPAP is ever reused.
Subsequent Message Management
The SAM message is used to send additional digits following an IAM in ITU. The IAM message needs to be buffered until the lifespan timer expires or the terminating signal (ST) is received from one or more SAM messages. The ITU SAM Overlap Timer attribute is configurable in the Route Mapping record based on the originating switch with default 30 seconds. On timer expiry, the IAM is sent as is.
On receipt of a SAM, check if a pending IAM exists. If the SAM is unexpected, discard the MSU. Append the SAM additional digits to the IAM Called Party Number parameter. If the ST signal is received, the IAM is complete and is sent out while the SAM itself is discarded. The IAM can also be deemed complete if a certain number of digits is received or a maximum number of SAM messages are received. The ITU Max CLD ANSI IAM and ITU Max Number of SAM attributes are configurable in the Route Mapping record based on the originating switch with default 32 and 2 respectively.
Fast Answer Conversion
On receipt of an ITU CON, convert to an ANSI ANM. A straight conversion is possible due to the compatibility between the two messages.
Send Twice Management
Some circuit group request messages need to be sent twice for old switches. If the corresponding ANSI Route Mapping record ANSI Send Message Twice attribute is enabled, send the resulting ANSI CBG, CGU and GRS twice.
The following table provides you with the ITU (ISUP) to ANSI (ISUP) message conversion details.
ITU (ISUP) to ANSI (ISUP) Message Conversion
Abbrv. | Code (decimal) | Message Type | Action | Description |
---|
IAM | 0x01 – (1)
| Initial Address | PROCESS | USI TMR conversion + subsequent message management and parameter processing. |
SAM | 0x02 – (2)
| Subsequent Address | PROCESS | Subsequent message management. |
INR | 0x03 – (3)
| Information Request | PROCESS | Parameter processing. |
INF | 0x04 – (4)
| Information | PROCESS | Parameter processing. |
ACM | 0x06 – (6)
| Address Complete | PROCESS | Parameter processing. |
CON | 0x07 – (7)
| Connect | PROCESS | Fast answer conversion and parameter processing. |
FOT | 0x08 – (8)
| Forward Transfer | DISCARD | Parameter incompatibility of Call Reference parameter due to point code reference. |
ANM | 0x09 – (9)
| Answer | PROCESS | Parameter processing. |
REL | 0x0c – (12)
| Release | PROCESS | Parameter processing. |
SUS | 0x0d – (13)
| Suspend | PROCESS | Parameter processing. |
RES | 0x0e – (14)
| Resume | PROCESS | Parameter processing. |
RLC | 0x10 – (16)
| Release Complete | PROCESS | Parameter processing. |
GRS | 0x17 – (23)
| Circuit Group Reset | PROCESS | See Circuit Group Message Management and Send Twice Management. |
CGB | 0x18 – (24)
| Circuit Group Blocking | PROCESS | See Circuit Group Message Management and Send Twice Management. |
CGU | 0x19 – (25)
| Circuit Group Unblocking | PROCESS | See Circuit Group Message Management and Send Twice Management. |
FAR | 0x1f – (31)
| Facility Request | DISCARD | Not supported in ANSI. |
FAA | 0x20 – (32)
| Facility Accept | DISCARD | Not supported in ANSI. |
FRJ | 0x21 – (33)
| Facility Reject | DISCARD | Not supported in ANSI. |
PAM | 0x28 – (40)
| Pass-along | DISCARD | Not used in cross network. |
CQM | 0x2a – (42)
| Circuit Group Query | PROCESS | See Circuit Group Message Management |
CPG | 0x2c – (44)
| Call Progress | PROCESS | Parameter processing. |
USR | 0x2d – (45)
| User to User Information | DISCARD | Not supported in ANSI. |
CFN | 0x2f – (47)
| Confusion | PROCESS | Parameter processing. |
OLM | 0x30 – (48)
| Overload | DISCARD | Not supported in ANSI. |
CRG | 0x31 – (49)
| Charge | DISCARD | National use only, not supported. |
NRM | 0x32 – (50)
| Network Resource Management | DISCARD | Not supported in ANSI. |
FAC | 0x33 – (51)
| Facility | PROCESS | Parameter processing. |
UPT | 0x34 – (52)
| User Part Test | DISCARD | Not supported in ANSI. |
UPA | 0x35 – (53)
| User Part Available | DISCARD | Not supported in ANSI. |
IDR | 0x36 – (54)
| Identification Request | DISCARD | Not supported in ANSI. |
IDS/IRS | 0x37 – (55)
| Identification Response | DISCARD | Not supported in ANSI. |
SGM | 0x38 – (56)
| Segmentation | DISCARD | Not supported in ANSI. |
LOP | 0x40 – (64)
| Loop Back Prevention | DISCARD | Not supported in ANSI. |
APM | 0x41 – (65)
| Application Transport | DISCARD | Not supported in ANSI. |
PRI | 0x42 – (66)
| Pre-release Information | DISCARD | Not supported in ANSI. |
The following table provides you with the ITU (ISUP) to ANSI (ISUP) parameter conversion details.
ITU (ISUP) and ANSI (ISUP) Parameter Conversion
Code (decimal) | Parameter Name | Action | Description |
---|
0x01 – (1)
| Call Reference | DISCARD | Point code incompatibility. |
0x02 – (2)
| Transmission Medium Requirement | PROCESS | See USI TMR Conversion (ITU to ANSI) |
0x03 – (3)
| Access transport | PROCESS | Discard parameter if message type is FAC; else, pass through. |
0x04 – (4)
| Called Party Number | PROCESS | See ANSI - ITU Parameter Definitions for the CLD information. Remove the ST signal if present (should have been remove by subsequent message management). If ANSI SS7 Variant Route Mapping ANSI Country Code is enabled and the Nature of Address is send to 0x04 (international), add the prefix country code signal of 1. If ANSI SS7 Variant Route Mapping ANSI CLD NOA is enabled and the NOA is not set in 0x01 to 0x04 inclusive, set NOA to 0x03 (national). |
0x05 – (5)
| Subsequent Number | PROCESS | See Subsequent Message Management |
0x07 – (7)
| Forward Call Indicators | PROCESS | See ANSI - ITU Parameter Definitions for the FCI information If ITU SS7 Variant Route Mapping ITU FCI International is enabled, set bit A to 1 (incoming international call) else, set bit A to 0 (not an incoming international call). |
0x0a – (10)
| Calling Party Number | PROCESS | See ANSI - ITU Parameter Definitions for the CLG information. If ANSI SS7 Variant Route Mapping ANSI CLG NOA is enabled and the NOA is not set in 0x01 to 0x04 inclusive, set NOA to 0x03 (national). |
0x0c – (12)
| Redirection Number | DISCARD | Procedure incompatibility. |
0x0d – (13)
| Connection Request | DISCARD | Point code included not compatible. |
0x11 – (17)
| Backward Call Indicator | PROCESS | See ANSI - ITU Parameter Definitions for the BCI information. Set BA to 00 (no indication). |
0x12 – (18)
| Cause Indicators | PROCESS | See ANSI - ITU Parameter Definitions for the Cause Indicators information. Return error in first or second octet is extended. If location is set to 0x01 (local private network), set to 0x05 (remote private network). If location is set to 0x02 (local local network), set to 0x04 (remote local network). If the cause value is set to 0x1b (Destination OOS), set to 0x01 (unallocated number). |
0x13 – (19)
| Redirection Information | PROCESS | Discard parameter if message type not IAM; else, pass through. |
0x16 – (22)
| Range and Status | PROCESS | See Circuit Group Message Management. |
0x17 – (23)
| Call Modification Indicators | DISCARD | No procedure either in ANSI or ITU. |
0x18 – (24)
| Facility Indicator | DISCARD | No procedure in ANSI. |
0x19 – (25)
| Facility Information Indicators | DISCARD | No procedure in ANSI. |
0x1a – (26)
| Closed User Group Interlock Code | DISCARD | No procedure in ANSI. |
0x1d – (29)
| User Service Information | PROCESS | See USI TMR Conversion (ANSI to ITU). |
0x1e – (30)
| Signaling Point Code | DISCARD | Point code incompatibility. |
0x20 – (32)
| User to User Information | DISCARD | Procedure incompatibility. |
0x21 – (33)
| Connected Number | DISCARD | No procedure in ANSI. |
0x23 – (35)
| Transit Network Selection | DISCARD | Procedure incompatibility. |
0x25 – (37)
| Circuit Assignment Map | DISCARD | Reserved in ITU. |
0x2a – (42)
| User to User Indicators | DISCARD | Procedure incompatibility. |
0x2b – (43)
| Origination ISC Point Code | DISCARD | Not supported in ANSI. |
0x2c – (44)
| Generic Notification | DISCARD | Not supported in ANSI. |
0x2d – (45)
| Call History Information | DISCARD | Not supported in ANSI. |
0x2e – (46)
| Access Delivery Information | DISCARD | Not supported in ANSI. |
0x2f – (47)
| Network Specific Facilities | DISCARD | Procedure incompatibility. |
0x30 – (48)
| User Service Information Prime | DISCARD | Procedure incompatibility. |
0x31 – (49)
| Propagation Delay Counter | DISCARD | Not supported in ANSI. |
0x32 – (50)
| Remote Operations | DISCARD | Procedure incompatibility. |
0x34 – (52)
| User Tell-service Information | DISCARD | Not supported in ANSI. |
0x35 – (53)
| Transmission Medium Used | PROCESS | Discard parameter if message type is not ACM, ANM, or CPG; else, pass through. |
0x36 – (54)
| Call Diversion Information | DISCARD | Not supported in ANSI. |
0x37 – (55)
| Echo Control Information | DISCARD | Not supported in ANSI. |
0x38 – (56)
| Message Compatibility Information | DISCARD | No procedure in ANSI. |
0x39 – (57)
| Parameter Compatibility Information | DISCARD | No procedure in ANSI. |
0x3a – (58)
| Multilevel Precedence and Pre-emption (MLPP) Precedence | DISCARD | Not supported in ANSI. |
0x3b – (59)
| Malicious Call Identification (MCID) Request Indicator | DISCARD | Not supported in ANSI. |
0x3c – (60)
| MCID Response Indicator | DISCARD | Not supported in ANSI. |
0x3e – (62)
| Transmission Medium Requirement Prime | PROCESS | See USI TMR Conversion (ANSI to ITU). |
0x3f – (63)
| Location Number | DISCARD | Not supported in ANSI. |
0x40 – (64)
| Redirection Number Restriction | DISCARD | Not supported in ANSI. |
0x41 – (65)
| Free-phone Indicators | DISCARD | Not supported in ANSI. |
0x42 – (66)
| Generic Reference | DISCARD | Not supported in ANSI. |
0x43 – (67)
| Call Transfer Reference | DISCARD | Not supported in ANSI. |
0x44 – (68)
| Loop Prevention Indicators | DISCARD | Not supported in ANSI. |
0x45 – (69)
| Call Transfer Number | DISCARD | Not supported in ANSI. |
0x4b – (75)
| Call Completion Service Setup (CCSS) | DISCARD | Not supported in ANSI. |
0x4c – (76)
| Forward Global Virtual Network Service (GVNS) | DISCARD | Not supported in ANSI. |
0x4d – (77)
| Backward GVNS | DISCARD | Not supported in ANSI. |
0x65 – (101)
| Correlation Identifier | DISCARD | Not supported in ANSI. |
0x66 – (102)
| Service Control Function (SCF) Identifier | DISCARD | Not supported in ANSI. |
0x6e – (110)
| Call Diversion Treatment Indicators | DISCARD | Not supported in ANSI. |
0x6f – (111)
| Called Intelligent Network (IN) Number | DISCARD | Not supported in ANSI. |
0x70 – (112)
| Call Offering Treatment Indicators | DISCARD | Not supported in ANSI. |
0x71 – (113)
| Charged Party Identification | DISCARD | Not supported in ANSI. |
0x72 – (114)
| Conference Treatment Indicators | DISCARD | Not supported in ANSI. |
0x73 – (115)
| Display Information | DISCARD | Not supported in ANSI. |
0x74 – (116)
| User ID (UID) Action Indicators | DISCARD | Not supported in ANSI. |
0x75 – (117)
| UID Capability Indicators | DISCARD | Not supported in ANSI. |
0x78 – (120)
| Application Transport | DISCARD | Not supported in ANSI. |
0x79 – (121)
| Collect Call Request | DISCARD | Not supported in ANSI. |
0xc0 – (192)
| Generic Number | PROCESS | Discard parameter if message type is not IAM; else, pass through. |
0xc7 – (199)
| Generic Name | DISCARD | Not supported in ITU. |
0xe2 – (226)
| Service Activation | DISCARD | Procedure incompatibility. |