1. An apparatus comprising:
a telephone;
a port on the telephone for disconnectably connecting an external source of information to the telephone, wherein the external source comprises a media device configured to present media to one or more users; and
on-hold functionality in the telephone operative while a call of the telephone is on hold, for presenting to a user of the telephone the information from the external source if the external source is connected to the port, and presenting to the user information transmitted to the telephone from a source other than the external source if no external source is connected to the port.
2. The apparatus of claim 1 wherein:
the on-hold functionality is adapted to present to the user information received from a telephone network if no external source is connected to the port.
3. The apparatus of claim 1 wherein:
the on-hold functionality is further adapted to present no information to the user, at the user’s option and irrespective of whether the external source is or is not connected to the port.
4. The apparatus of claim 2 further comprising:
a second port on the telephone for signaling to a telephone network whether or not to send information to the telephone while the call is on hold.
5. A method comprising:
in response to an external source of information being disconnectably connected to a port of a telephone, wherein the external source comprises a media device configured to present media to one or more users, the telephone presenting the information from the external source to a user of the telephone while a call of the telephone is on hold; and
in response to no external source of information being connected to the port, the telephone presenting information transmitted to the telephone from a source other than the external source to the user of the telephone while the call is on hold.
6. The method of claim 5 wherein:
presenting information from a source other than the external source comprises presenting information received from a telephone network.
7. The method of claim 5 further comprising:
in response to a selection by the user, presenting no information to the user while the call is on hold, irrespective of whether the external source is or is not connected to the port.
8. The method of claim 6 wherein:
presenting the information from the external source comprises
signaling the telephone network not to send information to the telephone while the call is on hold; and
presenting information received from a telephone network comprises
signaling the telephone network to send information to the telephone while the call is on hold.
9. The method of claim 6 wherein:
presenting the information from the external source comprises
signaling a telephone network not to send information to the telephone while the call is on hold;
presenting information from a source other than the external source comprises
signaling the telephone network to send information to the telephone while the call is on hold; and
presenting no information to the user comprises
signaling the telephone network not to send information to the telephone while the call is on hold.
10. The method of claim 9 wherein:
signaling the telephone network to send information comprises
sending a SIP \u201c200 OK\u201d message with an \u201ca=recvonly\u201d indication; and
signaling the telephone network not to send information comprises
sending the SIP \u201c200 OK\u201d message with an \u201ca=inactive\u201d indication.
11. The apparatus of claim 2 further comprising:
a communication interface on the telephone for communicating with the telephone network, wherein the communication interface is separate from the port.
12. The method of claim 6 wherein:
presenting information from a source other than the external source further comprises receiving the information from the telephone network at a communication interface of the telephone, wherein the communication interface is separate from the port.
13. A method comprising:
placing on hold a call which is connected between a telephone network and a first port on a telephone;
in response to an external source of first information being disconnectably connected to a second port of the telephone, the telephone presenting the first information to a user of the telephone while the call is on hold, wherein the external source comprises a media device configured to present media to one or more users; and
in response to the external source not being connected to the second port, the telephone presenting second information transmitted to the telephone from a source other than the external source to the user of the telephone while the call is on hold.
14. The method of claim 13 further comprising:
receiving the second information from the telephone network.
15. The method of claim 13 further comprising:
in response to a selection by the user, presenting no information to the user while the call is on hold, irrespective of whether the external source is or is not connected to the second port.
16. The method of claim 14 wherein:
presenting the first information comprises
signaling the telephone network not to send the second information to the telephone; and
presenting the second information comprises
signaling the telephone network to send the second information to the telephone.
17. The method of claim 15 further comprising:
receiving the second information from the telephone network and wherein:
presenting the first information comprises
signaling the telephone network not to send the second information to the telephone;
presenting the second information comprises
signaling the telephone network to send the second information to the telephone; and
presenting no information to the user comprises
signaling the telephone network not to send the second information to the telephone.
18. The method of claim 17 wherein:
signaling the telephone network to send the second information comprises
sending a SIP \u201c200 OK\u201d message with an \u201ca=recvonly\u201d indication; and
signaling the telephone network not to send the second information comprises
sending the SIP \u201c200 OK\u201d message with an \u201ca=inactive\u201d indication.
19. The apparatus of claim 1, wherein the port comprises a Universal Serial Bus port.
20. The method of claim 5, wherein the port comprises a Universal Serial Bus port.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An optical wavemeter using compressive sampling, comprising:
a slit, wherein a monochromatic source is incident on the slit;
a diffraction grating, wherein the diffraction grating produces an image of the slit in an image plane at a horizontal position that is wavelength dependent;
a mask, wherein the mask comprises a two-dimensional pattern of transmission variations and wherein the mask produces different vertical intensity channels for different spectral channels;
a complementary grating, wherein the complementary grating produces a stationary image of the slit independent of wavelength; and
a detector, wherein the detector measures vertical variations in intensity of the stationary image and wherein the mask is created so that a number of measurements made by the detector is less than a number of spectral channels sampled.
2. The wavemeter of claim 1, wherein the mask comprises a binary encoded mask.
3. The wavemeter of claim 2 wherein the detector measures two levels of intensity.
4. The wavemeter of claim 1, wherein the mask comprises a base-4 encoded mask.
5. The wavemeter of claim 4, wherein the detector measures fours levels of intensity.
6. The wavemeter of claim 1, wherein the detector comprises a two-dimensional detector array.
7. The wavemeter of claim 1, wherein the detector comprises a base-N encoded mask and the detector measures N levels of intensity.
8. The wavemeter of claim 1, wherein the mask comprises a single element photodiode and the mask is dynamically variable.
9. The wavemeter of claim 1, wherein the detector comprises a linear detector array.
10. The wavemeter of claim 1, wherein the detector comprises a single detector element.