[c-nsp] Dropping ISDN dialup access

[Kanagaraj Krishna]

Hi,
   We have an ISDN dialup customer who uses a ISDN modem on their side to 
connect to our network. On our side its connected to a outdated Xyplex router. 
Currently we are in the process of changing to a Cisco 7206 router with 8 port 
BRI-S/T. The issue is that with the cisco, whenever the customer dials in the 
call last for only 120seconds and drops. Any idea on solving this issue? 
Thanks.

Regards,
Kana