New Zealand openers Devon Conway and Tom Latham blunted Pakistan bowlers to guide their side to a solid 165 without loss at close on the second day of the first Test in Karachi on Tuesday.
Conway became the fastest New Zealand batter to complete 1,000 runs in his 11th Test when he reached 82 at close and was ably supported by Latham who was unbeaten on 78.
The highlight of Pakistan's batting was 103 by Salman, who anchored the innings after skipper Babar Azam fell in the first over of the day without adding to his overnight score of 161.
Southee, who finished with 3-69, finally ended the innings by trapping Salman leg before, completing 350 wickets in his 89th Test.
He is the third New Zealand bowler behind Richard Hadlee (431 in 86 Tests) and Daniel Vettori (362 in 113) to take 350 or more wickets in Tests.