supply of supply of signal post telephone for ibs suitable for ofc communcation. each set shall comprise one no of signal post telephone (spt) master unit (installed in sms office) along with one no. of slave unit(which shall be installed on ibs post).both master and slave must work on 24v dc and must be suitable for 25 kv ac re area. it shall work on ofc. make-epsilon,indisco or similar.warranty up to 30 month from date of delivery.supply of signal post telephone for ibs suitable for ofc communcation. each set shall comprise one no of signal post telephone (spt) master unit (installed in sms office) along with one no. of slave unit(which shall be installed on ibs post).both master and slave must work on 24v dc and must be suitable for 25 kv ac re area. it shall work on ofc. make-epsilon,indisco or similar.warranty up to 30 month from date of delivery.,supply of signal post telephone for ibs suitable for ofc communcation. each se t shall comprise one no of signal post telephone (spt) master unit (installed in sms office) a long with one no. of slave unit(which shall be installed on ibs post).both master and slave must work on 24v dc and must be suitable for 25 kv ac re area. it shall work on ofc. make-ep silon,indisco or similar.warranty up to 30 month from date of delivery. [ warranty period: 30 months a fter the date of delivery ] ]