Working towards me CCIE Voice Lab exam.....
I have 3745 Router with:
1 x NM-HDV
3 x PVDM-12
1 x VWIC-1MFT-E1 Module.
1 x 7960 Phone
I have placed a Loopback cable in the single E1 socket, but I get "RX <- BAD FRAME" received when debug isdn q921 is turned on. So this will not help me simulate a PSTN for me to see Q931 traffic.
Would a single VWIC-2MFT-E1 card be enough to simulate a ISDN q931 and q921 message if I loop the ports together with a E1 crossover and set one as USER and the other NETWORK?
I am trying to go for least cost solution with what I already have?
You need two different routers. You are connecting them back to back. You cant do this on the same router.
You need 1 router acting as PSTN
you need another router acting as the User side
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