Please refer to UM Business Policy and Procedure Manual, section 10-04, regarding Worker Compensation reporting and approved medical facilities. If it works, the problem is with the first phone. If the phone doesn't work and you have an answering machine, disconnect the answering machine. If the problem disappears, trouble is in that equipment. If you have a two-way splitter, remove it.
Splitters can cause damage to the jack.
If you cannot dial out with your telephone, the problem could be that the telephone is set to dial on pulse and not TONE . If the problem is disconnecting callers, check to see that the jack is snug to the wall, and all of its components are intact. If you have dial tone with a working phone, then your telephone set's switch hook flash could be the problem. The bottom portion is for data communications and connection to the University computing system. If you have determined that your telephone set is the problem, contact the manufacturer or the store where you purchased the telephone.