There have been substantial scientific works in the past years for finding adequate immobilization matrices for iodine radioisotopes. Lately, iodosodalite glass-ceramics or glasscomposites represent a promising material. Under pressure, glass-ceramics represent an even better material. In the present work, we have synthesised I-bearing glass-ceramics under low pressure conditions (0.5 GPa) and using a thermal step from melting (1250°C) to crystallization temperature (813°C). The produced materials show the coexistence between Irich iodosodalite (>10 mol.% I) and I-poor glass matrix (<1 mol.% I) and without the presence of detrimental crystalline phase such as nepheline. The iodosodalite proportion remains low though (~10%). Raman spectroscopy on the iodosodalite crystals seems to indicate that the β cage could be filled either with I$^-$ or IO3$^-$ species. The analyses of the glass structure using 11B NMR show an increase in the BO4 proportion that could suggest an increase in the chemical durability. In the end, the produced materials have most of the prerequisite for a relevant matrix for immobilization of iodine radioisotopes.