Support Tool
ISDN D-Channel Protocol Analyzer -------EPA
Introduction
An ISDN call connection failure can be diagnosed by using Prestige's ISDN embedded
protocol analyzer (EPA). The cause code in the EPA log
can also help us to diagnose the disconnection of an ISDN call.
Using EPA Analyzer
You must connect the Prestige to a terminal program via the serial port to capture the
EPA. The EPA will not operate by Telnet. The steps for enabling the EPA are as follows:
1. Enter to SMT Menu 11 and note which node N you will be dialing
2. Enter to SMT Menu 24.8
3. Enable the EPA capture capability by:
Prestige>isdn fw ana on
4. Manually dial to remote node N
Prestige>dev dial N (N is the node number in
Menu 11)
5. Wait for all progress messages, and manually drop the call:
Prestige>dev channel drop [bri0|bri1|all] (bri0
for B1 channel, bri1 for B2 channel, all for all channels)
6. Turn off the EPA by:
Prestige>isdn fw ana off
7. Dump the EPA by:
Prestige>isdn fw ana disp
The trace appears on the screen as in the following example. Please use PageUp and
PageDown to browse the EPA trace.
Example:
prestige> isdn fw ana on
prestige> dev dial 1
Start dialing for node <hinet>...
### Hit any key to continue.###
$$$ DIALING dev=2 ch=0..........
$$$ OUTGOING-CALL phone(4125678)
$$$ CALL CONNECT speed<64000> type<2> chan<0>
$$$ LCP opened
$$$ PAP sending user/pswd
$$$ IPCP negotiation started
$$$ CCP stopped
$$$ BACP stopped
$$$ IPCP opened prestige> dev chann drop
all
prestige> isdn fw ana off
prestige> isdn fw ana disp
00:00:01:18 8 bytes LAPD D
NT C SAPI=63 TEI=127UI P=0
00001111 Layer management
00000000 Reference Number,MSB:
00000000 Reference Number,LSB: 0
00000100 Message
Type : Identity check request
1000000- Action
indicator : 64
-------1 Extension
bit : final octet
00:00:03:18 8 bytes LAPD D
TE C SAPI=63 TEI=127UI P=0
00001111 Layer management
00000001 Reference Number,MSB:
00000000 Reference Number,LSB: 256
00000001 Message
Type : Identity request
1111111- Action
indicator : 127
-------1 Extension
bit : final octet
00:00:03:19 8 bytes LAPD D
NT C SAPI=63 TEI=127UI P=0
00001111 Layer management
00000001 Reference Number,MSB:
00000000 Reference Number,LSB: 256
00000010 Message
Type : Identity assigned
1100001- Action
indicator : 97
-------1 Extension
bit : final octet
00:00:03:19 3 bytes LAPD D
TE C SAPI=0 TEI=97 SABME P=1
00:00:03:20 3 bytes LAPD D
NT R SAPI=0 TEI=97 UA F=1
00:00:03:23 36 bytes LAPD D TE C
SAPI=0 TEI=97 INFO P=0 NR=0 NS=0
28
bytes Layer 3
Orig->
CallRef=1 PD=Q.931 SETUP
1 00000100 INFORMATION ELEMENT : Bearer
Capability
2 00000010 IE
length : 2 bytes
3 1------- Extension
bit : not continued
-00----- Coding
standard : CCITT coding standard
---01000 Info. trans.
cap. : Unrestricted Digit
4 1------- Extension
bit : not continued
-00----- Transfer
mode : Circuit Mode
---10000 Info. trans.
rate : 64 kbps
1 00011000 INFORMATION ELEMENT : Channel
Idetification
2 00000001 IE
length : 1 byte
3 1------- Extension
bit : not continued
-0------ Interface Id present:
implicitly
--0----- Interface
type : basic interface
---0---- Spare
----0--- Preferred/Exclusive :
preferred channel
-----0-- D Channel Indicator :
channel identified is not D Channel
------01 Info. Ch. Selection : B1
channel
1 01101100 INFORMATION ELEMENT : Calling Party
Number
2 00001001 IE
length : 9 bytes
3 0------- Extension
bit : continued
-000---- Type of
number : unknown
----0000 Numbering plan iden.:
unknown
3a 1------- Extension
bit : not continued
-00----- Presentation indic. :
presentation allowed
---000-- Spare
------00 Screeing indicator :
user provided, not screened
******** Calling Number Type :
[5009097]
1 01110000 INFORMATION ELEMENT : Called Party
Number
2 00001000 IE
length : 8 bytes
3 1------- Extension
bit : not continued
-000---- Type of
number : unknown
----0000 Numbering plan iden.:
unknown
******** Called Number Type :
[4125678]
00:00:03:23 4 bytes LAPD D
NT R SAPI=0 TEI=97 RR P/F=0 NR=1
00:00:03:28 11 bytes LAPD D NT C
SAPI=0 TEI=97 INFO P=0 NR=1 NS=0
3
bytes Layer 3
Dest->
CallRef=1 PD=Q.931 CALL_PROCE.
1 00011000 INFORMATION ELEMENT : Channel
Idetification
2 00000001 IE
length : 1 byte
3 1------- Extension
bit : not continued
-0------ Interface Id present:
implicitly
--0----- Interface
type : basic interface
---0---- Spare
----1--- Preferred/Exclusive : only
the channel is acceptable
-----0-- D Channel Indicator :
channel identified is not D Channel
------01 Info. Ch. Selection : B1
channel
00:00:03:29 4 bytes LAPD D
TE R SAPI=0 TEI=97 RR P/F=0 NR=1
00:00:03:59 11 bytes LAPD D NT C
SAPI=0 TEI=97 INFO P=0 NR=1 NS=1
3
bytes Layer 3
Dest->
CallRef=1 PD=Q.931 ALERTING
1 00110100 INFORMATION ELEMENT : Signal
2 00000001 IE
length : 1 byte
3 01000000 Signal
Value : alerting on-pattern 0
00:00:03:59 4 bytes LAPD D
TE R SAPI=0 TEI=97 RR P/F=0 NR=2
00:00:03:61 23 bytes LAPD D NT C
SAPI=0 TEI=97 INFO P=0 NR=1 NS=2
15
bytes Layer 3
Dest->
CallRef=1 PD=Q.931 CONNECT
1 00110100 INFORMATION ELEMENT : Signal
2 00000001 IE
length : 1 byte
3 00111111 Signal
Value : tones off
1 01001100 INFORMATION ELEMENT : Connected Number
2 00001010 IE
length : 10 bytes
******** Unknown IE content :
0x21 0x83 0x33 0x34 0x31
******** Unknown IE content :
0x32 0x35 0x36 0x37 0x38
00:00:03:62 4 bytes LAPD D
TE R SAPI=0 TEI=97 RR P/F=0 NR=3
00:00:03:63 8 bytes LAPD D
TE C SAPI=0 TEI=97 INFO P=0 NR=3 NS=1
0
bytes Layer 3
Orig->
CallRef=1 PD=Q.931 CONNECT_ACK
00:00:03:63 4 bytes LAPD D
NT R SAPI=0 TEI=97 RR P/F=0 NR=2
00:00:12:61 12 bytes LAPD D TE C
SAPI=0 TEI=97 INFO P=0 NR=3 NS=2
4
bytes Layer 3
Orig->
CallRef=1 PD=Q.931 DISCONNECT
1 00001000 INFORMATION ELEMENT : Cause
2 00000010 IE
length : 2 bytes
3 1------- Extension
bit : not continued
-00----- Coding
standard : CCITT coding standard
---0---- Spare
----0000
Location : user
4 1------- Extension
bit : not continued
-0010000 Cause
(Value) : normal call clearing |
00:00:12:62 4 bytes LAPD D
NT R SAPI=0 TEI=97 RR P/F=0 NR=3
00:00:12:75 12 bytes LAPD D NT C
SAPI=0 TEI=97 INFO P=0 NR=3 NS=3
4
bytes Layer 3
Dest->
CallRef=1 PD=Q.931 RELEASE
1 00001000 INFORMATION ELEMENT : Cause
2 00000010 IE
length : 2 bytes
3 1------- Extension
bit : not continued
-00----- Coding
standard : CCITT coding standard
---0---- Spare
----0000
Location : user
4 1------- Extension
bit : not continued
-0010000 Cause
(Value) : normal call clearing
00:00:12:76 4 bytes LAPD D
TE R SAPI=0 TEI=97 RR P/F=0 NR=4
00:00:12:76 8 bytes LAPD D
TE C SAPI=0 TEI=97 INFO P=0 NR=4 NS=3
0
bytes Layer 3
Orig->
CallRef=1 PD=Q.931 RLS_COMPLE
00:00:12:77 4 bytes LAPD D
NT R SAPI=0 TEI=97 RR P/F=0 NR=4
prestige> |
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Corporation.