Respect for the Azaan

Q: I would like to know what is the Sunnah regarding when the Adhan is being performed. At our Ibadaat Khanna a few of our Muslim brothers in Islam, are talking or having a conversation one of them is busy scrolling on his cell phone. This happens on a daily basis and  they are over 45 and 60 years of age.

Salaah with Jamaat

Q: Does the narration of Hazrat Ali Radhiyallahu Anhu regarding the neighbour of the masjid "his salaah will not be proper unless performed in the masjid" also apply to the neighbour of a musalla (jama'at khana)? If he hears the azaan of the Musalla, will it also be waajib to attend that jama'at?