Marten Rooimans
Guest
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 Posted:
Tue Dec 07, 2004 1:36 am Post subject:
Re: Help on error - Disconnect MD110 PABX incoming calls. |
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Hello Haim,
Allthough I do not know what can be done about the PBX and/or the GSM GW I can
see the following happening:
Frame 1 and 2 contain the RELEASE and RELEASE COMPLETE of the previous error
after the layer2 has been started again (look at the layer 2 sequence numbers
being 0.
From then on a new attempt is seen:
Frame 6: GSM GW sends a SETUP using layer2 snd seq nr 1.
Frame 7: The PBX responds with CALL PROC, followed later on by
Frame 9: ALERTING and
Frame11: CONNECT some 1.8 seconds after the ALERTING.
After that the GSM GW attempts to CONNECT ACK the CONNECT from the PBX:
Frame13: This is the CONNECT ACK from the GSM GW. Note that it uses the
layer2 snd seq nr 1! This is the same as used for the SETUP message.
As the PBX does not expect this message with snd seq nr 1 it does REJ the
frame at layer2. So the PBX discards the CONNECT ACK and will keep waiting for
it at layer3.
The layer2 is also reset with a SABME / UA cycle (frames 15 and 16).
After some time the corresponding layer3 timer (T313) expires and the PBX
clears the connection according to the spec. That is the reason you see the
DISCCONNECT with cause #102 (frame 17).
So the problem lies with the GSM GW. It uses a wrong "snd seq nr" on the
CONNECT ACK frame.
Hope this helps...
Marten
haim@quasar.co.il (Haim Berdah) wrote:
| Quote: | Hey Everybody,
I am connecting a BRI GSM GW to MD110 PBX (TLU79 BRI CARD).
When trying to make incoming calls to the PABX I am getting
disconnected.
If the Extension is answering after 5 rings the call is going through
OK.
THE GSM GW is configuered as NT and the PBX as TE.
Any help on what can be done in terms of configuration in the PBX in
order to avoid this situation will be appreciated.
Attach is the Trace Log: (Take a look on frames 12-17)
Frame : 1 Dir : TE->NT Date : 2004/06/08 Time : 10:13:58.738
Length : 12 FCS : Good
EDSS-1
Direction : TE->NT
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Command
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : I (Information)
N(S) (Send Sequence Number) : 0
N(R) (Receive Sequence Number) : 0
Poll/Final : Poll
Frame Check Sequence (FCS) : Good
ISDN LAYER 3
Protocol Discriminator : 0x08
Call Reference Length : 1
Call Reference Flag : Call Origin Side
Call Reference Value : 0x02
Message Type : RELEASE
Cause : Normal call clearing
Information Element Identifier : CAUSE
Information Element Length : 2
Hex. value : 81 90
Coding stand. : CCITT
Location : Private/local
Cause Class : Normal
: Normal call clearing
Hexadecimal Trace
0000 : 00 01 00 00 08 01 02 4D 08 02 81 90 .......M....
Frame : 2 Dir : NT->TE Date : 2004/06/08 Time : 10:13:58.792
Length : 8 FCS : Good
EDSS-1
Direction : NT->TE
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Command
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : I (Information)
N(S) (Send Sequence Number) : 0
N(R) (Receive Sequence Number) : 1
Poll/Final : Poll
Frame Check Sequence (FCS) : Good
ISDN LAYER 3
Protocol Discriminator : 0x08
Call Reference Length : 1
Call Reference Flag : Call Receiver Side
Call Reference Value : 0x02
Message Type : RELEASE COMPLETE
Cause : -
Hexadecimal Trace
0000 : 02 01 00 02 08 01 82 5A .......Z
Frame : 3 Dir : TE->NT Date : 2004/06/08 Time : 10:13:58.796
Length : 4 FCS : Good
EDSS-1
Direction : TE->NT
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Response
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : RR (Receive Ready)
N(R) (Receive Sequence Number) : 1
Poll/Final : Final
Frame Check Sequence (FCS) : Good
Hexadecimal Trace
0000 : 02 01 01 02 ....
Frame : 4 Dir : TE->NT Date : 2004/06/08 Time : 10:14:08.623
Length : 4 FCS : Good
EDSS-1
Direction : TE->NT
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Command
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : RR (Receive Ready)
N(R) (Receive Sequence Number) : 1
Poll/Final : Poll
Frame Check Sequence (FCS) : Good
Hexadecimal Trace
0000 : 00 01 01 03 ....
Frame : 5 Dir : NT->TE Date : 2004/06/08 Time : 10:14:08.631
Length : 4 FCS : Good
EDSS-1
Direction : NT->TE
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Response
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : RR (Receive Ready)
N(R) (Receive Sequence Number) : 1
Poll/Final : Final
Frame Check Sequence (FCS) : Good
Hexadecimal Trace
0000 : 00 01 01 03 ....
Frame : 6 Dir : TE->NT Date : 2004/06/08 Time : 10:14:11.788
Length : 38 FCS : Good
EDSS-1
Direction : TE->NT
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Command
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : I (Information)
N(S) (Send Sequence Number) : 1
N(R) (Receive Sequence Number) : 1
Poll/Final : Poll
Frame Check Sequence (FCS) : Good
ISDN LAYER 3
Protocol Discriminator : 0x08
Call Reference Length : 1
Call Reference Flag : Call Origin Side
Call Reference Value : 0x02
Message Type : SETUP
Cause : -
Information Element Identifier (Single Byte) : SEND.COMPLETE
Information Element Identifier : BEARER CAPABIL
Information Element Length : 3
Hex. value : 90 90 A3
Coding stand. : CCITT coding
Info tr.capab : 3.1 kHz audio
Transfer mode : Circuit mode
Info tr.rate : 64 kbit/s
: Layer 1 ident.
User info l-1 : Rec.G.711 Alaw
Information Element Identifier : CHANNEL IDENT.
Information Element Length : 1
Hex. value : 89
Chan. select. : B1 channel
: Exclusive
: Not D-channel
: Int.implicitly
Information Element Identifier : CALLING PTY NB.
Information Element Length : 12
Hex. value : 00 80 30 39 34
: 31 33 30 35 33 36 39
Type of numb. : Unknown
Number. plan : Unknown
Present.indic : Allowed
Screening ind : U.prov.nt.scre
No.digits/IA5 : 0941305369
Information Element Identifier : CALLED PARTY NB
Information Element Length : 5
Hex. value : 80 32 30 30 30
Type of numb. : Unknown
Number. plan : Unknown
No.digit/IA-5 : 2000
Hexadecimal Trace
0000 : 00 01 02 02 08 01 02 05 A1 04 03 90 90 A3 18 01
................
0010 : 89 6C 0C 00 80 30 39 34 31 33 30 35 33 36 39 70
.l...0941305369p
0020 : 05 80 32 30 30 30 ..2000
Frame : 7 Dir : NT->TE Date : 2004/06/08 Time : 10:14:11.855
Length : 11 FCS : Good
EDSS-1
Direction : NT->TE
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Command
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : I (Information)
N(S) (Send Sequence Number) : 1
N(R) (Receive Sequence Number) : 2
Poll/Final : Poll
Frame Check Sequence (FCS) : Good
ISDN LAYER 3
Protocol Discriminator : 0x08
Call Reference Length : 1
Call Reference Flag : Call Receiver Side
Call Reference Value : 0x02
Message Type : CALL PROCEEDING
Cause : -
Information Element Identifier : CHANNEL IDENT.
Information Element Length : 1
Hex. value : 89
Chan. select. : B1 channel
: Exclusive
: Not D-channel
: Int.implicitly
Hexadecimal Trace
0000 : 02 01 02 04 08 01 82 02 18 01 89 ...........
Frame : 8 Dir : TE->NT Date : 2004/06/08 Time : 10:14:11.859
Length : 4 FCS : Good
EDSS-1
Direction : TE->NT
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Response
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : RR (Receive Ready)
N(R) (Receive Sequence Number) : 2
Poll/Final : Final
Frame Check Sequence (FCS) : Good
Hexadecimal Trace
0000 : 02 01 01 04 ....
Frame : 9 Dir : NT->TE Date : 2004/06/08 Time : 10:14:11.995
Length : 16 FCS : Good
EDSS-1
Direction : NT->TE
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Command
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : I (Information)
N(S) (Send Sequence Number) : 2
N(R) (Receive Sequence Number) : 2
Poll/Final : Poll
Frame Check Sequence (FCS) : Good
ISDN LAYER 3
Protocol Discriminator : 0x08
Call Reference Length : 1
Call Reference Flag : Call Receiver Side
Call Reference Value : 0x02
Message Type : ALERTING
Cause : -
Information Element Identifier : PROGRESS INDIC.
Information Element Length : 2
Hex. value : 81 88
Coding stand. : CCITT
Location : Priv.net.s.loc
Progress desc : In-band info or patt. avail.
Information Element Identifier : PROGRESS INDIC.
Information Element Length : 2
Hex. value : 81 82
Coding stand. : CCITT
Location : Priv.net.s.loc
Progress desc : Destination addr. is non-ISDN
Hexadecimal Trace
0000 : 02 01 04 04 08 01 82 01 1E 02 81 88 1E 02 81 82
................
Frame : 10 Dir : TE->NT Date : 2004/06/08 Time : 10:14:11.998
Length : 4 FCS : Good
EDSS-1
Direction : TE->NT
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Response
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : RR (Receive Ready)
N(R) (Receive Sequence Number) : 3
Poll/Final : Final
Frame Check Sequence (FCS) : Good
Hexadecimal Trace
0000 : 02 01 01 06 ....
Frame : 11 Dir : NT->TE Date : 2004/06/08 Time : 10:14:13.819
Length : 20 FCS : Good
EDSS-1
Direction : NT->TE
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Command
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : I (Information)
N(S) (Send Sequence Number) : 3
N(R) (Receive Sequence Number) : 2
Poll/Final : Poll
Frame Check Sequence (FCS) : Good
ISDN LAYER 3
Protocol Discriminator : 0x08
Call Reference Length : 1
Call Reference Flag : Call Receiver Side
Call Reference Value : 0x02
Message Type : CONNECT
Cause : -
Information Element Identifier : PROGRESS INDIC.
Information Element Length : 2
Hex. value : 81 82
Coding stand. : CCITT
Location : Priv.net.s.loc
Progress desc : Destination addr. is non-ISDN
Information Element Identifier : CONNECTED NUMB
Information Element Length : 6
Hex. value : 01 81 32 30 30
: 30
Type of numb. : Unknown
Number. plan : ISDN/tel./E164
Present.indic : Allowed
Screening ind : U.prov.ver.psd
No.digits/IA5 : 2000
Hexadecimal Trace
0000 : 02 01 06 04 08 01 82 07 1E 02 81 82 4C 06 01 81
............L...
0010 : 32 30 30 30 2000
Frame : 12 Dir : TE->NT Date : 2004/06/08 Time : 10:14:13.821
Length : 4 FCS : Good
EDSS-1
Direction : TE->NT
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Response
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : RR (Receive Ready)
N(R) (Receive Sequence Number) : 4
Poll/Final : Final
Frame Check Sequence (FCS) : Good
Hexadecimal Trace
0000 : 02 01 01 08 ....
Frame : 13 Dir : TE->NT Date : 2004/06/08 Time : 10:14:13.828
Length : 11 FCS : Good
EDSS-1
Direction : TE->NT
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Command
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : I (Information)
N(S) (Send Sequence Number) : 1
N(R) (Receive Sequence Number) : 4
Poll/Final : Poll
Frame Check Sequence (FCS) : Good
ISDN LAYER 3
Protocol Discriminator : 0x08
Call Reference Length : 1
Call Reference Flag : Call Origin Side
Call Reference Value : 0x02
Message Type : CONNECT ACKNOWLEDGE
Cause : -
Information Element Identifier : CHANNEL IDENT.
Information Element Length : 1
Hex. value : 89
Chan. select. : B1 channel
: Exclusive
: Not D-channel
: Int.implicitly
Hexadecimal Trace
0000 : 00 01 02 08 08 01 02 0F 18 01 89 ...........
Frame : 14 Dir : NT->TE Date : 2004/06/08 Time : 10:14:13.836
Length : 4 FCS : Good
EDSS-1
Direction : NT->TE
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Response
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : REJ (Reject)
N(R) (Receive Sequence Number) : 2
Poll/Final : Final
Frame Check Sequence (FCS) : Good
Hexadecimal Trace
0000 : 00 01 09 04 ....
Frame : 15 Dir : TE->NT Date : 2004/06/08 Time : 10:14:15.588
Length : 3 FCS : Good
EDSS-1
Direction : TE->NT
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Command
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : SABME (Set Asynchronous Balanced Mode Extended)
Poll/Final : Poll
Frame Check Sequence (FCS) : Good
Hexadecimal Trace
0000 : 00 01 7F ..
Frame : 16 Dir : NT->TE Date : 2004/06/08 Time : 10:14:15.596
Length : 3 FCS : Good
EDSS-1
Direction : NT->TE
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Response
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : UA (Unnumbered Acknowledgement)
Poll/Final : Final
Frame Check Sequence (FCS) : Good
Hexadecimal Trace
0000 : 00 01 73 ..s
Frame : 17 Dir : NT->TE Date : 2004/06/08 Time : 10:14:18.026
Length : 15 FCS : Good
EDSS-1
Direction : NT->TE
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Command
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : I (Information)
N(S) (Send Sequence Number) : 0
N(R) (Receive Sequence Number) : 0
Poll/Final : Poll
Frame Check Sequence (FCS) : Good
ISDN LAYER 3
Protocol Discriminator : 0x08
Call Reference Length : 1
Call Reference Flag : Call Receiver Side
Call Reference Value : 0x02
Message Type : DISCONNECT
Cause : Protocol error
Information Element Identifier : CAUSE
Information Element Length : 5
Hex. value : 81 E6 33 31 33
Coding stand. : CCITT
Location : Private/local
Cause Class : Protocol error
: Recovery on timer expiry
Timer/IA-5 : 313
Hexadecimal Trace
0000 : 02 01 00 00 08 01 82 45 08 05 81 E6 33 31 33 .......E....313
Frame : 18 Dir : TE->NT Date : 2004/06/08 Time : 10:14:18.030
Length : 4 FCS : Good
EDSS-1
Direction : TE->NT
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Response
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : RR (Receive Ready)
N(R) (Receive Sequence Number) : 1
Poll/Final : Final
Frame Check Sequence (FCS) : Good
Hexadecimal Trace
0000 : 02 01 01 02 ....
Frame : 19 Dir : TE->NT Date : 2004/06/08 Time : 10:14:19.007
Length : 8 FCS : Good
EDSS-1
Direction : TE->NT
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Command
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : I (Information)
N(S) (Send Sequence Number) : 0
N(R) (Receive Sequence Number) : 1
Poll/Final : Poll
Frame Check Sequence (FCS) : Good
ISDN LAYER 3
Protocol Discriminator : 0x08
Call Reference Length : 1
Call Reference Flag : Call Origin Side
Call Reference Value : 0x02
Message Type : RELEASE
Cause : -
Hexadecimal Trace
0000 : 00 01 00 02 08 01 02 4D .......M
Frame : 20 Dir : NT->TE Date : 2004/06/08 Time : 10:14:19.041
Length : 8 FCS : Good
EDSS-1
Direction : NT->TE
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Command
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : I (Information)
N(S) (Send Sequence Number) : 1
N(R) (Receive Sequence Number) : 1
Poll/Final : Poll
Frame Check Sequence (FCS) : Good
ISDN LAYER 3
Protocol Discriminator : 0x08
Call Reference Length : 1
Call Reference Flag : Call Receiver Side
Call Reference Value : 0x02
Message Type : RELEASE COMPLETE
Cause : -
Hexadecimal Trace
0000 : 02 01 02 02 08 01 82 5A .......Z
Frame : 21 Dir : TE->NT Date : 2004/06/08 Time : 10:14:19.045
Length : 4 FCS : Good
EDSS-1
Direction : TE->NT
Decode Status : -
ISDN LAYER 2
ADDRESS FIELD:
SAPI (Service Access Point Identifier) : 0
Command/Response : Response
Extension Bit 1 : 0
TEI (Terminal Endpoint Identifier) : 0
Extension Bit 2 : 1
CONTROL FIELD:
Type : RR (Receive Ready)
N(R) (Receive Sequence Number) : 2
Poll/Final : Final
Frame Check Sequence (FCS) : Good
Hexadecimal Trace
0000 : 02 01 01 04 .... |
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