Determine about the call and put option
A call/ put option provision allow both issuing company and investor to redeem the bonds at a specified amount before maturity date. Long term bonds (10 years or more) generally have a call/ put option is attached to bond which is (usually) exercisable after every 5 year intervals. In this case issuing company has a call option that it can call back the bonds and repay to investors the principal and interest due till that date. If issuer exercises his call option the investor has no recourse but to submit his bonds and get money. Likewise the investor has a put option, in which case he has an option to return the bonds and get principal and interest till that date. As in earlier case if investor exercises his option, company has no recourse though to pay the investor.