All telegraph offices or stations from which messages are transmitted, or at which messages are received for transmission shall be equipped with proper telephone connections in order that messages and communications may be expeditiously transferred from telegraph to telephone lines or from telephone to telegraph lines when such transfer will accelerate the transmission of any such messages or communications: provided, that nothing herein is intended to require said telegraph companies or any one operating or controlling any telegraph system or office within this state to build a telephone line, it being intended to require such company to install a telephone in each of its offices where such telephone can be obtained by it, as it may be obtained by other business offices in the same vicinity.