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x.25 Virtual Circuit (VC) registration

x.25 Virtual Circuit (VC) registration

(OP)
Scenario
2 x.25 links working providing telephony information from a Nortel DMS-100 PBX. The x.25 session setup is initiated to the DMS-100 using Dialogic Eicon S64 cards. There was some sort of problem with the telephony side of things and in the process of fault finding it, the connection of those 2 links were swapped at the DMS-100 end. One link came up and the other one didn't. What we found was:

On the link that didn't work, the Eicon card was configured with 16 Virtual Circuits (VC's) and Nortel DMS-100 configured with 1 VC (unknown to us). The x.25 connection wouldn't work even though tracing showed the DMS was responding with 1 VC. Once we had the DMS-100 configured with 16 VC's or the Eicon configured with 1 VC, x.25 came up.

Conversely, on the other link, where the Eicon card was configured with 1 VC and the DMS-100, as we found out later, was configured with 16 VC's, x.25 worked ok

Does the initiator of an x.25 session (in this case the Eicon card), try to register/setup the VC using the highest number it is configured for down?

Thanks

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