Hi,
Actually i have set up an E1 ISDN Pri between a Cisco 3845 and an avaya PBX, problem is that E1 is flapping up and down with no aparent reason. not really sure why.
I did the configuration following the config guide Cisco 2621 Gateway-PBX Interoperability: Lucent/Avaya Definity G3si with E1 PRI NET5 Signaling from the following link:
http://www.cisco.com/en/US/solutions/ns340/ns414/ns728/networking_solutions_products_genericcontent0900aecd805bd0e4.html
attached you will find the isdn q931 q921 debugs.
ios version c3845-advipservicesk9-mz.151-1.T.bin CUCM 7.1.5
Thanks.