Decoding Q931 Facility Messages

Discussion of modems, ISDN and cable modems.

Decoding Q931 Facility Messages

Postby John Neiberger » Tue Nov 15, 2005 12:55 am

First of all, forgive me for the newby question. :-)

Do any of you know how to interpret the "Facility i = " field in the output
of "debug isdn q931" ? I'm trying to debug some QSIG call transfer and
path replacement stuff and I can't figure out what I'm even looking at.

As an example (taken from a Cisco router):

*Nov 10 19:12:56.031: ISDN Se0/0/0:23 Q931: TX -> FACILITY pd = 8
callref = 0x0022
Facility i = 0x9FAA068001008201008B0100A11F02020A0002010C30160A0101A00EA5090A010412043738
32300A01030A0100

How do I figure out which q931 message that actually is? It is most likely a
QSIG call transfer message, but I need to know for sure, and I also need to
figure out which messages in my logs are QSIG path replacement messages.

Any ideas?

Thanks!
John
John Neiberger
 

Re: Decoding Q931 Facility Messages

Postby Guest » Mon Dec 12, 2005 4:20 am

THOSE LETTERS AND NUMBERS ARE CODE AND YOU'LL NEED A PROTOCOL ANALYZER
TO INTERPRET WHAT THE CODE MEANS. IN ALL MY YEARS OF TECH SUPPORT,
I'VE ONLY MET ONE GUY WHO CAN ACTUALLY READ THAT MESSAGE WITHOUT AN
ANALYZER. GOOD LUCK.
Guest
 


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