Adhan inside or outside the Masjid

Q: Is it an act of Sunnah that a Mu'adhin (caller for prayer) announces Adhan (call to Prayer) outside the Masjid (mosque), not inside where nobody can see him? Should he use loudspeakers only from inside the Masjid or should he come out of the Masjid and use the loudspeakers? Should the Mu'adhin who has performed two Rak`ahs then sat down in the Masjid before coming out to announce Adhan perform two Rak`ahs after finishing Adhan before sitting in the Masjid again or not? If there is a temporary or permanent excuse such as the wire being cut, disorder in the loudspeaker or lack of a long wire which prevents the Mu'adhin to announce Adhan from outside the Masjid using the loudspeaker at the same time, should he announce Adhan outside the Masjid with his own voice only or may he announce Adhan from inside using a loudspeaker to inform as many people as he can? Is there any difference between the Adhan of the Friday Prayer and the Adhan of other prayers regarding this case?

(Part No. 6; Page No. 70)  A: Firstly, Adhan in its due time is the slogan of Islam, an announcement of the due time of Salah and a call to it. It is authentically reported on the authority of Anas (may Allah be pleased with him) that: Whenever the Messenger of Allah (peace be upon him) attacked some people, he would never attack them till it was dawn. If he heard the Adhan (i.e. call for prayer) he would delay the fight, and if he did not hear the Adhan, he would attack them immediately after dawn. Related by Ahmad and Al-Bukhari. If the meaning of Adhan is to announce the rite of Islam, announce prayer time and call to it, so whenever a Mu'adhin announces Adhan inside the Masjid, at its door or on its roof, whether people see him at the time of Adhan or not, he has fulfilled what is required by the Shari`ah taking into consideration that the Mu'adhin should be of a loud voice to announce even if he uses loudspeakers. There is no difference between the Adhan for Friday prayer or any other prayer. Secondly, If a Mu'adhin ascends the roof of the Masjid, or goes out of the Masjid door to announce Adhan after he has performed two rak`ahs on entering the masjid, he shouldn't repeat them again after Adhan, because the roof, the doors and all internal utilities are attached to the Masjid and part of it. It is a sunnah for him to pray two rak`ahs between Adhan and Iqamah (second call for prayer) because of the authentic Hadith (Part No. 6; Page No. 71)  There is between the two calls (Adhan and Iqama) a prayer. He repeated it twice, and in the third time he said: This applies to those who wish to do it. He should perform the prior regular sunnah prayer for the prayer to which he announced Adhan as if he did not offer a two-unit-prayer to greet the mosque, it is preferable to offer it after Adhan and the regular sunnah will suffice for it.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.