A telecommunications system and method for increasing communications bandwidth for an Internet Service Provider ("ISP") to accommodate temporary fluctuations in demand. The present invention utilizes an Advanced Intelligent Network ("AIN") to re-direct calls from a subscriber to an ISP from the ISP's modem pools to a shared modem pool operated by a telephone service provider ("telco") when the ISP needs additional bandwidth. The shared modem pool is controlled by an access server and a remote authentication dial-in user service server managed by the telco. The telco servers identify the identified ISP to receive the call by looking at the original number dialed by the caller. The telco servers then communicate with the proper ISP which determines whether or not the caller is a valid subscriber of the ISP.