Paul Jewell was pleased with the way his team responded after going a goal down to Bristol Rovers.
A terrific strike from Michael Smith gave the visitors the lead but Jason Scotland equalised five minutes before the break, before further goals from Tommy Smith and Arran Cresswell saw Blues book a place in the second round.
“We had lots of the ball but didn’t move it around quickly enough,” the Town boss told Ipswich Player.
“Credit to Bristol, they made it hard for us but once we got into the team at half-time, we got our game going and some of the football we played was first class.
“The players showed good character to come back – and then again after the penalty miss [Michael Chopra’s kick was saved by Sam Walker] with Tommy Smith scoring from a corner straight after.
“It was a good delivery from Jet [Jay Emmanuel-Thomas] and we are looking for our defenders to score goals from set-pieces. If they can chip in with five or six goals during the season then that can make a massive difference.”