Assuming the Avaya is also IP then yes, you can do SIP or H323 between CUCM and the Avaya. Or, if the Avaya isn't SIP, then you can terminate a Qsig trunk on a Cisco GW which then communicates with CUCM via whatever IP protocol you want to use.
Of course, other than the trunk you use, you need to set up the dial-plans on the Cisco side and the Avaya side so that each knows what calls to route to each other.
ITU states that max latency for voip shouldn't exceed 150 ms one way, and no packet loss.
Then yeah, you'd need to terminate the Avaya to a cisco voice gateway in some manner. Since this isn't integrating voice-mail or anything, you can just set up a normal T1 CAS, T1 PRI, Qsig trunk, FXS etc...some sort of analog or TDM connection, it all depends on what the Avaya supports. You then terminate this to an interface on the cisco router, then route calls to CUCM from the cisco gateway via dial-peer routing. On the GW and CUCM you can use SIP, H323 or MGCP, it's really up to you and your preference.
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...