QSIG MWI Debug ISDN Q931

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Apr 20th, 2009
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Does anyone have a good debug q931 of an QSIG MWI to a Nortel 1000M or any other pbx? I am having issues lighting the Nortel phones MWI and am seeing some different bearer cap information than a standard station to station call. I have attached the q931 debug that shows a normal call and also an attempt to light the MWI.





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gogasca Tue, 04/21/2009 - 02:54
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*Apr 20 16:24:17.327 DLS-MST: ISDN Se0/0/0:23 Q931: TX -> SETUP pd = 8 callref = 0x002D

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 = 0x9FAA06800100820100A1170202009B020150300EA5090A01001204323131350A0120

Calling Party Number i = 0x0081, N/A

Plan:Unknown, Type:Unknown

Called Party Number i = 0x80, '2115'

Plan:Unknown, Type:Unknown

*Apr 20 16:24:17.395 DLS-MST: ISDN Se0/0/0:23 Q931: RX <- CALL_PROC pd = 8 callref = 0x802D

Channel ID i = 0xAC

Exclusive, Channel 2

*Apr 20 16:24:17.431 DLS-MST: ISDN Se0/0/0:23 Q931: RX <- RELEASE pd = 8 callref = 0x802D

Cause i = 0x8195 - Call rejected

*Apr 20 16:24:17.431 DLS-MST: ISDN Se0/0/0:23 Q931: TX -> RELEASE_COMP pd = 8 callref = 0x002D


Code for MWI is A8 80 you will see that in the bearer capability, Nortel PBX is returning "Call Rejected" Cause i = 0x8195


Please verify with Nortel why they are rejecting the call to CUCM for MWI.

Last month we worked with Nortel and problem was Nortel rejecting the call because of ISDN Numplan/Type Plan

They were set to national, national, ISDN, ISDN. They were changed this way because the

PBX was not accepting some calls. I changed them all back to cisco callmanager, and the PBX accepted the MWI request. But thats something Nortel should answer


scott.searle Tue, 04/21/2009 - 06:25
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Thanks for the reply. Why does the MWI request change the bearer to "Unrestricted Digital"? I have been modifying the number plan but with no success, I'll verify with their Nortel team. Do you remember what version of software they were running on the Nortel side?

gogasca Tue, 04/21/2009 - 13:04
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Unfortunatly I dont have the version, but here is a working one


Feb 18 16:44:33.610 CST: ISDN Se1/0:23 Q931: RX <- SETUP pd = 8

callref = 0x1201

Sending Complete

Bearer Capability i = 0xA880

Standard = ISO/IEC

Transer Capability = Unrestricted Digital

Transfer Mode = Circuit

Transfer Rate = Packet - not specified

Channel ID i = 0xAC

Facility i = 0x9FAA068001008201008B0102A12402020D00020151301BA5090A0104120438383032

0A 0101A10BA5090A0104120433313030

Calling Party Number i = 0xC9, '3100'

Plan:Private, Type:Subscriber(local)

Called Party Number i = 0xC9, '8802'

Plan:Private, Type:Subscriber(local)


Transer Capability is not relevant at all, the MWI code is the most important option.


Let us know



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