Bharat Sanchar Nigam [BSNL] — landline/ incoming isd calls not working

Address:

Lalbazar, 190001

Whenever my mother try to call from an international number to my landline number in j&k its ivr telling number doesnt exist.. Could you tell what might be the problem in the landline number how to fix it. The landline number is from dalgate area and number is 2501846. And i am calling to this number from saudi.. The number is accurate and active but whenever i am calling from saudi to this number it telling number doesnt exist.. Please kindly reslove ir or suggest me how to fix