On 22 July 1914, the Austro-Hungarian Minister of Foreign Affairs Leopold Count Berchtold (pictured) sent a coded private telegram to the Austro-Hungarian Ambassador to Germany Laszlo Count Szogyeny. In his message, Berchtold refers to the Austro-Hungarian ultimatum to Serbia.
Count Berchtold to Count Szogyeny in Berlin. Vienna, 22 July 1914
Cyphered telegram. —Private.
The decree of the 20th of July in Germany’s case was a mere form: the official delivery of our note [i.e. the Austro-Hungarian ultimatum to Serbia] was to take place in Berlin under the same modalities as in the case of the other Signatory Powers.
By strict privacy we communicated the note in question (which contains the text of the note to Servia) to Herr von Tschirschky [the German Ambassador to Austria-Hungary] yesterday; the Ambassador has no doubt by this time forwarded it to Berlin.
Source: 1919 Austro-Hungarian Red Book, with minor edits.