SIP Username and Password for Avaya Phone


I am trying to setup an Avaya 9601 SIP Phone with asterisk
I need the SIP Username and password to login to the phone and be able to make/receive calls.

I have tried the 4 igit number on my other phone (CISCO 7940) with no luck

Can someone help with this and tell me where I an fin the sip username and password please.

Thanks in Advance.