Modem on hold
First Claim
1. A first modem for communication with a second modem over a communication channel, said first modem being in communication with a handset, said first modem comprising:
- an off-hook detector capable of detecting said handset going off-hook, while said first modem is in communication with said second modem, and further being capable of generating an attention signal in response thereto; and
a transmitter capable of transmitting a hold request to said second modem in response to said attention signal;
wherein said handset is placed off-hook by a user for dialing an outgoing call, and wherein said communication between said modems over said communication channel ceases for a period of time after transmitting said hold request, and wherein said first modem keeps an upper layer protocol alive during said period of time by manufacturing data and presenting said data to an upper layer to maintain an appearance of receiving said data from said second modem.
5 Assignments
0 Petitions
Accused Products
Abstract
A modem to modem communication system supports call waiting services by exchanging hold request and acknowledge signals before relinquishing the line servicing incoming calls. Thereafter, the modem to modem session is reestablished without having to redial. The hold request may be denied or accepted, and may define the duration a modem will hold before hanging up. The holding modem maintains the session by fooling the higher protocol layers, making them believe that the modem is not on hold. Three-way calling services are also used to free up the shared line for outgoing calls while maintaining the session with holding modems. A table may be employed to screen incoming calls through a comparison of the caller ID information with that in the table. The table may be within the modem or the host computer.
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Citations
23 Claims
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1. A first modem for communication with a second modem over a communication channel, said first modem being in communication with a handset, said first modem comprising:
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an off-hook detector capable of detecting said handset going off-hook, while said first modem is in communication with said second modem, and further being capable of generating an attention signal in response thereto; and
a transmitter capable of transmitting a hold request to said second modem in response to said attention signal;
wherein said handset is placed off-hook by a user for dialing an outgoing call, and wherein said communication between said modems over said communication channel ceases for a period of time after transmitting said hold request, and wherein said first modem keeps an upper layer protocol alive during said period of time by manufacturing data and presenting said data to an upper layer to maintain an appearance of receiving said data from said second modem. - View Dependent Claims (2, 3, 5, 6)
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4. The first modem of 1, wherein said first modem receives an acknowledgement in response to said hold request.
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7. A communication method for use between a first modem and a second modem in communication over a communication channel, said first modem being in communication with a handset, said communication method comprising the steps of:
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detecting said handset going off-hook;
transmitting a hold request to said second modem in response to said handset going off-hook;
ceasing said communication with said second modem over said communication channel by said first modem for a period of time;
causing a dial tone to be generated for dialing an outgoing call using said handset; and
keeping an upper layer protocol alive during said period of time by manufacturing data and presenting said data to an upper layer to maintain an appearance of receiving said data from said second modem. - View Dependent Claims (8, 9, 10, 11)
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12. A first modem capable of communicating with a second modem over a communication channel, a portion of said communication channel existing over a telephone line between said first modem and a central office, said first modem comprising:
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a receiver capable of receiving a relinquishment request, while said telephone line is in use by said first modem for communication with said second modem, to relinquish said use of said telephone line; and
a transmitter capable of transmitting a hold request to said second modem to place said communication between said modems on hold;
wherein said communication between said modems is placed on hold and said use of said telephone line is relinquished, and wherein said first modem causes a dial tone to be generated over said telephone line after said communication between said moderns is placed on hold, and wherein said first modem keeps an upper layer protocol alive while said modems are on hold by manufacturing data and presenting said data to an upper layer to maintain an appearance of receiving said data from said second modem. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method of sharing a telephone line for use by a first modem, said first modem being in communication with a second modem over a communication channel, a portion of said communication channel existing over said telephone line between said first modem and a central office, said method comprising:
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receiving a relinquishment request, while said telephone line is in use by said first modem for communication with said second modem, to relinquish said use of said telephone line;
transmitting a hold request to said second modem to place said communication between said modems on hold;
placing said communication between said modems on hold;
keeping an upper layer protocol alive by manufacturing data and presenting said data to an upper layer to maintain an appearance of receiving said data from said second modem;
relinquishing said use of said telephone line; and
causing a dial tone to be generated over said telephone line. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification