I have two remote site of CUCM (one site has E1 and one has SIP) can I connect between both sites to be able to call local phones with each other between two sites?
or I need to make both SIP?
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i have many customer with the same scenario what you have. i did ICT for most cases. There are some other way as well SIP trunk or CUBE also. but i prefer to use ICT and for you i recommend to do inter-cluster trunk to avoid confusion and make it simple.
I am curios to know why you are advising the OP to use a dying protocol. Why would you advise anyone today to use ICT. No one is developing H323 protocol anymore and most endpoints run SIP today. Have you considered the inter operability issues between SIP endpoints and H323?DTMF, supplementary services etc?
OP: Please use SIP trunks between your clusters.