It happened in the days of R' Chalafta and R' Chananyah ben Teradyon that one went before the Ark and completed the entire blessing, but they did not respond Amen after the blessing.  “Sound the tekiah, O Kohanim, sound the tekiah.” “He Who answered our father Abraham on Mount Moriah, He shall answer you and hearken to the sound of your cry this day.” “Sound the teruah, O sons of Aaron, sound the teruah.” “He Who answered our forefathers at the Red Sea, He shall answer you and hearken to the sound of your cry this day.”  When the matter came before the Sages, they said: Such was not our custom except at the Eastern Gate and on the Temple Mount.