Yes. A conference is held in 1915, pressured by Germany, Austria, who is at this point so much under the German thumb that they are puppet state, are forced to the table. In it, they agree to hand the Austrian territories of Istria, Zara, South Tyrol, Trieste and Dalmatia. I believe in our timeline it was a more limited concession offered; if Germany is doing worse than in our timeline, they would be pushed to offer more, or if Italian support was relatively more important (i.e. stronger Italian military, weaker Austria). Austria would be horrified to lose her key port and public opinion would be outraged, but they have to except Germany's dictat. In return, Italy joins the war on the Central Powers' side, with a promise to gain Tunisia, Corisca, Savoy and Nice from the French if they do. The Alpine Front has begun.