Call Manager Migration 7.1.5 to 9.1 / Trunking : ICT vs. SIP

Hello All,
Currently studying for CCNA Voice and have been asked by my current employer to upgrade CUCM 7.1.5 to 9.1.1. There has been a time frame put on the deployment however I want to dig pretty deep into the deployment to learn as much as possible. I am going to start by configuring a trunk between the 2 call manager clusters. from there I will add users to the new call manager and try to convert slowly to the new call manager instead of one big cutover. I will place a route pattern over the trunk so that cucm 9.1 will route through cucm 7.1 while I slowly convert users to the new system. I will then deploy directory numbers in a Staging partition that is not associated with any CSS. Once I have all users and phones configured on the new 9.1 call manager I want to use the bulk admin tool to change the staging partition to the working internal_PT production partition. The users will be imported from LDAP. My questions are, does this sound like a feasible plan? Is there any other difference between a SIP trunk and ICT besides the SIP and H.323 protocol? ( I prefer SIP from what I have read) and will having the same users on both boxes interfere with call processing, if these users and phones are not active yet?

Just for the record. I found the solution to my problem. Checking more logs I read this:
The installation has encountered a unrecoverable internal error. For further assistance report the following information to your support provider.
"/usr/local/cm/script/cm-dbl-ontape_backup-install RU PostInstall 9.1.2.11900-12 7.1.5.30000-1 /usr/local/cm/ /common/component/database /common/log/install/capture.txt " terminated. Exceeded max time (240)
The system will now halt.
So I accessed the Dissaster Recovery Section on CUCM and deleted the tape backup device that was configured there. After deleting it the upgrade went well.

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Call Manager Migration 7.1.5 to 9.1 / Trunking : ICT vs. SIP

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