Televised sewer from pulled toilet. Toilet is on a branch line along wit’s laundry. Toilet only has problems when toilet is used. No problems when using laundry. Cast pipe is only slightly scaled but is in good condition. There is a plastic horn that is built into the toilet that appears to be crimped in order to get it into place on the toilet collar that is offset. Suggest possibly replacing toilet collar then also replacing toilet with a gerber avalanche toilet. Recommend Bills plumbing if they service this area.