I have a Cisco 2821 with 4 ISDN BRI vics (VIC-2bri/nt-te). Trying to
integrate with Polycom VSX 7000 videoconferencing unit with 4 BRI units on it as well. I have used the
following link to setup a BRI cross over cable with pins 3,4,5,6 crossed.
I have tried making two different cables but the links dont come up. Switch setting on
both ends are set to National ISDN1. Show isdn status output shows DEACTIVATED.
THe configs on the Cisco router are as follows.
no ip address
isdn switch-type basic-ni
isdn timer T309 30000
isdn protocol-emulate network
isdn tei-negotiation first-call
isdn layer1-emulate network
isdn spid1 XXXX
isdn spid2 XXXX
isdn incoming-voice voice
isdn supp-service name calling