The two former-Soviet neighbours exchanged fire overnight but there were no reports of casualties.
A Moscow-mediated truce went into effect on Tuesday after the worst outbreak of violence since the 1990s, but some clashes have continued, with two people reported killed yesterday.
The Armenian defence ministry said Azerbaijan fired on the border area in northern Tavush region 16 times, including with "large calibre" weaponry, but said the intensity of shooting had "subsided".
Baku in turn said Armenia used 60-mm mortars and other firepower to "violate the ceasefire 120 times" overnight, firing on Azeri positions in northern Gazakh, Tovuz and Agstafa regions, among others.
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Armenia-backed separatists seized control of Nagorny Karabakh, which is located inside Azerbaijan's territory but populated mainly by Christian ethnic Armenians, in an early 1990s war that claimed some 30,000 lives.
Shooting along the contact line with Nagorny Karabakh as well the Azeri-Armenian border had been a regular occurence for years.
World leaders have urged Baku and Yerevan to refrain from further violence and to step up efforts aimed at finding a diplomatic solution to the protracted conflict.