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GTD and OLI (origination line information). problem

Unanswered Question
Nov 2nd, 2005
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Hello Everybody ..(sorry for my english)


Im having a problem with a cisco AS5400 and my isdn provider.

I can't recognize a payphone call.I mean that I can recognize the OLI (origination line information)

to know the origination line type.


I have configured the GTD as cisco describes here http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t15/ftgtdisd.htm.




this is my conf .. I have a T3 ,so i configured 28 T1 and 28 serial interfaces.

I only need to receive calls so i don't use voice ports to outgoing calls.


controller T3 6/0

framing m23

clock source line

cablelength 450

t1 1-28 controller

exit

controller T1 6/0:1

framing esf

pri-group timeslots 1-24

trunk-group NY timeslots 1-24

description PAETEC#1

exit

interface Serial6/0:1:23

no ip address

isdn switch-type primary-ni

isdn incoming-voice modem

no isdn incoming alerting add-PI

no cdp enable

isdn ie oli 37

isdn gtd

exit



I debuged the isdn to analize an incoming packet when a call is from a payphone.

This is the packet:

6w0d: ISDN Se6/0:26:23 Q931: RX <- SETUP pd = 8 callref = 0x0144

Bearer Capability i = 0x8090A2

Standard = CCITT

Transfer Capability = Speech

Transfer Mode = Circuit

Transfer Rate = 64 kbit/s

Channel ID i = 0xA9838A

Exclusive, Channel 10

Progress Ind i = 0x8283 - Origination address is non-ISDN

Calling Party Number i = 0x2183, '2019439707'

Plan:ISDN, Type:National

Called Party Number i = 0xA1, '8004010562'

Plan:ISDN, Type:National

Transit Net Select i = 0xA1, '340'

Locking Shift to Codeset 6

Codeset 6 IE 0x37 i = 0x04, 'r'

6w0d: ISDN Se6/0:26:23 Q931d: L3IF_rx_L2_pak: received data

6w0d: 080201440504038090A21803A9838A1E

6w0d: 0282836C0C2183323031393433393730

6w0d: 37700BA1383030343031303536327804

6w0d: A13334309637020472


Here i can see de OLI (origination line information) in the last four bytes of the isdn packet:

"37020472"

In my configuration I used "isdn ie oli 37" so the cisco can recognice the oli and try to parse it:

so ,we have

"37" oli ie identificator.

"02" size of the oli info (2 bytes)

0472 oli info. where 72 means the origination line type. payphone must be in this case but

"72" isn't in the cisco doc that I posted above.


In the cisco doc they tell that payphone is:

27—payphone using coin control signaling


so 0x72 .. must be 0x27 .. the byte is reversed.

I think thats my problem ,but i didn't find anything to reverse the byte again to obtain an 0x27..


somebody know how to fix it?.


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