When you add additional interfaces it will require some memory for interface data structures and buffering of traffic in and out of those interfaces. And additional interfaces will probably result in higher volume of traffic being forwarded which might impact memory usage.
But addiing more T1s does not automatically mean that you need to upgrade memory. What is the memory utilization in the router currently? If you are running high on memory utilization already then it would make good sense to upgrade memory before doing the interface addition. But if there is currently plenty of available memory then you should be able to add T1s without requiring a memory upgrade.
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The forum is an excellent way to learn about Cisco networking. I encourage you to continue your participation in the forum.
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