Before I describe the issue, I'll give a brief overview of the setup . Customer has Call manager cluster for entire campus at a remote site , at the main site they have NEC 2400 PBX and Octel VM system. VM integration for this remote site is done through VG248 to Octel at the main site. For internal dialing between Main site and campus they have QSIG Tieline going through Telco. At the RS QSIG is terminated to a CMM module and MS directly to NEC 2400. Everything was working fine , suddenly customer started seeing dropped calls. PBX phones call IP phone in the middle of conversation suddenly caller will hear busy tone at the PBX side and at the IP phone side just dead air call timer will be fine on the IP phone eventually call disconnects. PBX log shows CM sends random MWI messages and causes call to disconnect , MWI through QSIG is not supported for NEC 2400 but in this case normal MWI is going through VG248 fine and no MWI issues at the remote site at all. We couldn't find where this random MWI's is generated and why it is going through QSIG, these are not regular MWI's going through wrong device. Here is the trace file and let me know if anybody can help from this
058688: Jul 8 05:56:38: ISDN Se1/1:23 Q931: TX -> SETUP pd = 8 callref
= 0x0003
Sending Complete
Bearer Capability i = 0xA880
Standard = ISO/IEC
Transfer Capability = Unrestricted Digital
Transfer Mode = Circuit
Transfer Rate = Packet - not specified
Channel ID i = 0xAC
Exclusive, Channel 34
Facility i =
0x9FAA06800100820100A117020106020151300FA50A0A0100120533383036310A0120
Calling Party Number i = 0x0081, N/A
Plan:Unknown, Type:Unknown
Called Party Number i = 0x80, '38061'
Plan:Unknown, Type:Unknown
058689: Jul 8 05:56:38: ISDN Se1/1:23 Q931: RX <- STATUS pd = 8
callref = 0x8003
Cause i = 0x85E41C - Invalid information element contents
Call State i = 0x06
058690: Jul 8 05:56:39: ISDN Se1/1:23 Q931: RX <- RELEASE_COMP pd = 8
callref = 0x8003
Cause i = 0x85E41C - Invalid information element contents
Facility i = 0x9FAA06800100820100A307020106020203F3
058691: Jul 8 05:56:39: ISDN Se1/0:23 Q931: TX -> SETUP pd = 8 callref
= 0x0003
Sending Complete
Bearer Capability i = 0xA880
Standard = ISO/IEC
Transfer Capability = Unrestricted Digital
Transfer Mode = Circuit
Transfer Rate = Packet - not specified
Channel ID i = 0xAC
Exclusive, Channel 34
Facility i =
0x9FAA06800100820100A117020106020151300FA50A0A0100120533383036310A0120
Calling Party Number i = 0x0081, N/A
Plan:Unknown, Type:Unknown
Called Party Number i = 0x80, '38061'
Plan:Unknown, Type:Unknown
058692: Jul 8 05:56:39: ISDN Se1/0:23 Q931: RX <- STATUS pd = 8
callref = 0x8003
Cause i = 0x85E41C - Invalid information element contents
Call State i = 0x00
058693: Jul 8 05:56:39: ISDN Se1/0:23 Q931: RX <- RELEASE_COMP pd = 8
callref = 0x8003
Cause i = 0x85E41C - Invalid information element contents
Facility i = 0x9FAA06800100820100A307020106020203F3
Thanks in advance for your help.
CM version - 7.0.2
CMM IOS - 12.4.15T9
Bala
