Watch key moments from FA Cup drawPompey earned an Emirates FA Cup replay against Ipswich with a 2-2 draw at Portman Road.
But they dominated their Championship hosts for long periods and were unfortunate not to be ahead by the break.
Instead it was the Tractor Boys who broke the deadlock when, after Brian Murphy did well to keep out Brett Pitman's shot, Tommy Oar converted the loose ball.
The Blues were soon level, though, as Gary Roberts and Marc McNulty combined well to tee-up Kyle Bennett for a cool finish.
Substitute Conor Chaplin then looked to have won it late on, sending a precise shot into the bottom corner.