Hello,
in a previous post, somebody posted a configuration in which the AUX port of the 2500 was connected to an ISDN TA, and that apparently worked. Here is the post:
I hv config for the same (AUX port connected to ISDN TA) and its working fine.so we can say that AUX port can understand ISDN signals with the help of ISDN modem or ISDN TA.For the ref, i am pasting the reqd. config which is running fine. In my case, router is 2500 series having only serial port & not having a single BRI port.My ISDN TA (ISDN modem) connected to aux port of router and i hv created dialer for ISDN
username xxxxxx password xxxxxxxx
chat-script dialout "" "ATDT \T" TIMEOUT 120 \C
modemcap entry AT&F&C1&D2S0=1H0
interface Serial0
backup delay 0 50
backup interface Dialer1
ip address x.x.x.x x.x.x.x
no ip route-cache
no ip mroute-cache
down-when-looped
interface Async1
no ip address
encapsulation ppp
no ip route-cache
no ip mroute-cache
async mode dedicated
dialer in-band
dialer rotary-group 1
no cdp enable
interface Dialer1
ip unnumbered Serial0
encapsulation ppp
no ip route-cache
no ip mroute-cache
dialer in-band
dialer idle-timeout 100
dialer string xxxxxxx
dialer-group 1
no cdp enable
ppp pap sent-username xxxxxx password xxxxxxxxxx
line aux 0
exec-timeout 0 0
autoselect ppp
script dialer dialout
modem InOut
modem autoconfigure discovery
autocommand ppp
transport input all
stopbits 1
speed 38400
HTH,
GP
