[asterisk-ss7] libss7 CGU / CGUA type funnies

[Matthew Fredrickson]

Sorry, that's a bug in my code.  I'm looking at it right now to fix it  
:-)

Matthew Fredrickson

On Mar 26, 2007, at 10:43 AM, Charl Barnard wrote:

> Hi All,
>
> We've recently discovered something strange running libss7 (r74):  
> seems like
> when the switch we're connected to sends us a Circuit Group Unblock  
> message
> with type Maintenance oriented, libss7 responds with an acknowlegement  
> for
> type Hardware failure oriented, instead of Maintenance, and vice versa  
> when
> CGU is received with message type Hardware-please see the following  
> trace:
>
> +---------+--------------------------------------------- 
> +-------------------
> -----------------+
> |BITMASK  |ID Name                                      |Comment or  
> Value
> |
> +---------+--------------------------------------------- 
> +-------------------
> -----------------+
> |5:08:34 PM,851,406  1:E (Rx):15  MTP-L2  MSU  ISUP  CGU  0-XXX-0   
> 2-XXX-0
> 000-02           |
> |MTP Level 2 (MTP-L2)  MSU (= Message Signal Unit)
> |
> |Message Signal Unit
> |
> |-0000111 |Backward Sequence Number                     |7
> |
> |1------- |Backward Indicator Bit                       |1
> |
> |-1100000 |Forward Sequence Number                      |96
> |
> |1------- |Forward Indicator Bit                        |1
> |
> |--010000 |Length Indicator                             |16
> |
> |00------ |Spare                                        |0
> |
> |----0101 |Service Indicator                            |ISDN User Part
> |
> |--00---- |Sub-Service: Priority                         
> |Spare/priority 0
> (U.S.A. only)      |
> |00------ |Sub-Service: Network Ind                     |International
> message               |
> |**b14*** |Destination Point Code                       |0-XXX-0
> |
> |**b14*** |Originating Point Code                       |2-XXX-0
> |
> |ITU-T WHITE BOOK ISDN User Part (ISUP)  CGU (= Circuit Group  
> Unblocking)
> |
> |Circuit Group Unblocking
> |
> |0010---- |Signalling Link Selection                    |2
> |
> |**b12*** |Circuit Ident Code                           |000-02
> |
> |0000---- |Spare                                        |0
> |
> |00011001 |Message Type                                 |25
> |
> |------00 |Cct grp supervis msg type                    |Maintenance
> oriented                |
> |000000-- |Spare                                        |0
> |
> |00000001 |Pointer to parameter                         |1
> |
> |Range and status
> |
> |00000101 |Parameter Length                             |5
> |
> |00011101 |Range                                        |29
> |
> |**b30*** |Status
> |'111111111111110111111111111111'B   |
> |00------ |Filler                                       |0
> |
>
> +---------+--------------------------------------------- 
> +-------------------
> -----------------+
> |BITMASK  |ID Name                                      |Comment or  
> Value
> |
> +---------+--------------------------------------------- 
> +-------------------
> -----------------+
> |5:08:34 PM,925,025  1:F (Rx):15  MTP-L2  MSU  ISUP  CGUA  2-XXX-0   
> 0-XXX-0
> 000-02          |
> |MTP Level 2 (MTP-L2)  MSU (= Message Signal Unit)
> |
> |Message Signal Unit
> |
> |-1100000 |Backward Sequence Number                     |96
> |
> |1------- |Backward Indicator Bit                       |1
> |
> |-0001000 |Forward Sequence Number                      |8
> |
> |1------- |Forward Indicator Bit                        |1
> |
> |--010000 |Length Indicator                             |16
> |
> |00------ |Spare                                        |0
> |
> |----0101 |Service Indicator                            |ISDN User Part
> |
> |--00---- |Sub-Service: Priority                         
> |Spare/priority 0
> (U.S.A. only)      |
> |00------ |Sub-Service: Network Ind                     |International
> message               |
> |**b14*** |Destination Point Code                       |2-XXX-0
> |
> |**b14*** |Originating Point Code                       |0-XXX-0
> |
> |ITU-T WHITE BOOK ISDN User Part (ISUP)  CGUA (= Circuit Group  
> Unblocking
> Ack.)              |
> |Circuit Group Unblocking Ack.
> |
> |0000---- |Signalling Link Selection                    |0
> |
> |**b12*** |Circuit Ident Code                           |000-02
> |
> |0000---- |Spare                                        |0
> |
> |00011011 |Message Type                                 |27
> |
> |------01 |Cct grp supervis msg type                    |Hardware  
> failure
> oriented           |
> |000000-- |Spare                                        |0
> |
> |00000001 |Pointer to parameter                         |1
> |
> |Range and status
> |
> |00000101 |Parameter Length                             |5
> |
> |00011101 |Range                                        |29
> |
> |**b30*** |Status
> |'111111111111110111111111111111'B   |
> |00------ |Filler                                       |0
> |
>
> Any ideas? This obviously leaves the two ends confused about circuit  
> state.
>
> Thanks,
>
> Charl
>
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