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Problem with CLAM facility

Problem with CLAM facility

(OP)
Hi,

Recently, I´ve come across with some problems when setting up X.25 calls between my network and an external provider.
I have a Unix machine with two X.25 cards connected to two Cisco 3600 routers ( one card to each switch; one card is active, the other is in standby mode ), which have access to the X.25 provider cloud.

When I initiate a call to the destination using SW1, it completes without problems, but the CALL CONNECTED packet indicates the CLAM facility has been encoded due to hunt group call distribution. Actually, I can see in the traces that the destination address has been changed by the other end.
However, when trying the same call on SW2 ( configs and all are exactly the same ) the CALL CONNECTED packet shows the following:

"Bad Destination Address, Dest. address modified with no CLAM"

As a result, a CLEAR packet is sent from my device to abort the call setup. What is really surprising is that the destination address has also been changed by the other end to the same changed destination address as in the first case ( SW1 ).

See the traces below:

SW1:
Feb 9 11:41:23.112: Serial1/1: X.25 I R1 Call (18) 8 lci 495
Feb 9 11:41:23.112: From (10): 3581228210 To (8): 31419748
Feb 9 11:41:23.112: Facilities: (0)
Feb 9 11:41:23.112: Call User Data (4): 0xFA003176 (unknown)
Feb 9 11:41:23.116: Serial0/0: X.25 O R1 Call (18) 8 lci 543
Feb 9 11:41:23.116: From (10): 3581228210 To (8): 31419748
Feb 9 11:41:23.116: Facilities: (0)
Feb 9 11:41:23.116: Call User Data (4): 0xFA003176 (unknown)
Feb 9 11:41:23.360: Serial0/0: X.25 I R1 Call Confirm (16) 8 lci 543
Feb 9 11:41:23.360: From (10): 3581228210 To (8): 31419716
Feb 9 11:41:23.360: Facilities: (2)
Feb 9 11:41:23.360: Called Line Address Modified notice, reason 0x7: hunt group call distribution
Feb 9 11:41:23.360: Serial1/1: X.25 O R1 Call Confirm (16) 8 lci 495
Feb 9 11:41:23.360: From (10): 3581228210 To (8): 31419716
Feb 9 11:41:23.360: Facilities: (2)
Feb 9 11:41:23.360: Called Line Address Modified notice, reason 0x80: specified by destination
SW2:
Feb 9 11:35:17.306: Serial1/1: X.25 I R1 Call (18) 8 lci 500
Feb 9 11:35:17.306: From (10): 3581228210 To (8): 31419748
Feb 9 11:35:17.306: Facilities: (0)
Feb 9 11:35:17.306: Call User Data (4): 0xFA003176 (unknown)
Feb 9 11:35:17.310: Serial0/0: X.25 O R1 Call (18) 8 lci 548
Feb 9 11:35:17.310: From (10): 3581228210 To (8): 31419748
Feb 9 11:35:17.310: Facilities: (0)
Feb 9 11:35:17.310: Call User Data (4): 0xFA003176 (unknown)
Feb 9 11:35:17.450: Serial0/0: X.25 I R1 Call Confirm (14) 8 lci 548
Feb 9 11:35:17.450: From (10): 3581228210 To (8): 31419716
Feb 9 11:35:17.450: Facilities: (0)
Feb 9 11:35:17.450: X.25 Call Confirm packet, Bad destination address, Dest. address modified with no CLAM
Feb 9 11:35:17.450: Serial0/0: X.25 O R1 Clear (5) 8 lci 548
Feb 9 11:35:17.450: Cause 0, Diag 67 (DTE originated/Invalid destination address)
Feb 9 11:35:17.478: Serial0/0: X.25 I R1 Clear Confirm (3) 8 lci 548
Feb 9 11:35:17.478: Serial1/1: X.25 O R1 Clear (5) 8 lci 500
Feb 9 11:35:17.478: Cause 9, Diag 0 (Out of order/No additional information)
Feb 9 11:35:17.490: Serial1/1: X.25 I R1 Clear Confirm (3) 8 lci 500


Does anybody know anything about this kind of problem?

Thanks,
ET

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