From the website:
When Israel started producing its own weapons, one of the most important was the Soltam 120mm mortar based on a Finnish design. This weapon was simple to manufacture, making it ideal for Israel's fledgling armaments industry, yet packed a hefty punch. Nearly half of Israel's artillery battalions were equipped with 120mm mortars in 1967.
Unusually for mortars, these weapons are fielded by the artillery and have the skills, equipment, and ammunition to fire sustained bombardments.