Technical Helpweb

ISUP PROT VIOL is output on the Dialogic® IMG 1010 Integrated Media Gateway (IMG 1010) CLI Terminal
 

22:27:22.534 SS7 (F) ISUP PROT VIOL (000003d8/0037-0037/0) comp:0x12 err:4 mi d:0x01 pid:0x0a

Reason for the issue

The output above gives the following information about the ISUP protocol violation:

DPC: 0x000003d8
CIC (From): 0x0037
CIC Range (To): 0x0037
SS7 Stack id: 0
Comp : 0x12 (SS7 PPL Component id 0x12 - ISUP CPC)
err : 4 (Error Type 4 - Maximum Parameter Length Violation)
mid : 0x01 (ISUP message id 1 - IAM)
pid : 0x0a (ISUP parameter id 0x0a - Calling Party Number)

The pre-1997 ITU ISUP specification defines the maximum parameter length of the Calling Party Number parameter as 12 bytes.

The post-1997 ITU ISUP specification changed the maximum length to 'unlimited' (Table 32/Q.763, ITU-T Recommendation Q.763 (1997), Signaling System No. 7 – ISDN User Part formats and codes).

Message Type: Initial address
 

NOTE 2 – Peer-to-peer interworking with an earlier version of ISUP may result in format errors and lead to the release of the call.


Fix / Solution

Select 'ITU 97' as the ISUP variant when configuring the IMG 1010 SS7 Stack.

ISUP protocol violation Error Type List:
NOTE: Entries marked with a dagger (†) report the ISUP message type only and do not report an ISUP parameter.
0x01† Unrecognized Message Type
0x02 Unrecognized Parameter ID
0x03 Minimum Parameter Length Violation
0x04 Maximum Parameter Length Violation
0x05† Corrupt Parameter Data
0x06† Mandatory Parameters Missing
0x07 Range Field of Range/Status Parameter is zero
 

Product List

Dialogic® IMG 1010 Integrated Media Gateway

Glossary of Acronyms / Terms

ISUP -  ISDN User Part
ISUP CPC - Call Processing Control
DPC - Destination Point Code
ISUP CIC - Circuit Identification Code
ISUP IAM - Initial Address Message

Related Documentation

ITU-T Recommendation Q.763 (1997), Signalling System No. 7 – ISDN User Part formats and codes.