Telecom infrastructure companies have asked state-run firm BSNL to clear dues totalling Rs 1,500 crore on urgent basis, saying they are unable to meet critical expenses necessary for maintaining the telco’s network. The non-payment, the firms said, so far has already resulted in mobile service outage at various places in the country. Group of eight infrastructure firm under Tower & infrastructure Providers Association has written to BSNL Chairman and Managing Director P K Purwar, seeking clearance of dues as they are facing problem in paying for electricity, diesel, batteries procur-ement, etc for maintaining telecom PSU’s network which led to service outage in several areas.