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New Member

ISDN between two 1600 routers V12.12

- Router A and Router B connect using ISDN. Router A dials Router B's SPID1 and gets connected. But second cahnnel never connects since Router A is trying to dial the Router B's SPID1 again while its busy already.

Router A IOS is V12.12 (c1600-y-mz.122-12 IP only) while router B IOS is: c1600-bnr2y-mz.122-12.bin (IBM, IP)

2 REPLIES
New Member

Re: ISDN between two 1600 routers V12.12

Is this on an ISDN simulator? The way that this is supposed to work is that the second call to the same nu,ber should be routed to the second B channel (like a hunt group). This usually works OK if the ISDN circuit goes through the telco, BUT ALMOST NEVER WORKS on an ISDN simulator.

Bronze

Re: ISDN between two 1600 routers V12.12

Try "isdn fast-rollover-delay 2" on the calling router; assuming it has 2 dialer strings configured, we should then try the next string. If this doesn't help, "debug dialer", "debug isdn q931" and the config of the dialing router would be of interest.

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