I sometimes get Switch Congestion errors (2A) without having lack of ports at that moment. I have 2 E1's connected to it (60 lines) and sometinmes get that error, despite the fact that half or more of the ports are free.
router#sh call his voice last 25 | incl DisconnectText
router#sh call resour voice stat
using the above two commands you can analyze. Probably I think you have congestion as 2A error represents that only. Compare and see both the outputs line by line. Also you had shutdown two E1 ports, I the above two commands you will see the output for all the 4 ports and the percentage that you will see was for all the 4 ports check the channels is for 60 or for 120 ports. This will give you an idea of the congestion on the ports
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