Network administered conference call using SIP messaging

1. A method for establishing a conference call between a VoIP device, a first peer device, and a second peer device, the method comprising:

sending a first session request through a fixed packet network to a communications server, wherein the first session request is used to establish a first communication session between the VoIP device and the first peer device;

sending a request to place the first communication session between the VoIP device and the first peer device on hold, wherein the request comprises a SIP Invite or a SIP INFO message; and

while the first communication session between the VoIP device and the first peer device is maintained in an on hold condition:

receiving at the VoIP device an indication message from the communications server indicating that the communications server is ready to receive DTMF signals to initiate a second communication session between the VoIP device and the second peer device; and

sending a second session request, wherein the second session request comprises one or more DTMF signals, the one or more DTMF signals comprising information that is used to initiate the second communication session between the VoIP device and the second peer device.

2. The method of claim 1 , wherein the fixed packet network comprises a broadband network.

3. The method of claim 1 , wherein the fixed packet network comprises an IP network.

4. The method of claim 1 , wherein the VoIP device is operable to communicate through a fixed packet network, and also through a cellular network.

5. The method of claim 1 , wherein the first session request comprises the SIP Invite message.

6. The method of claim 1 , wherein the request to place the first session between the VoIP device and the first peer device on hold comprises the SIP INFO message.

7. The method of claim 1 , wherein the DTMF signal comprises the number of the second peer device.

8. The method of claim 1 , wherein the DTMF information is carried using RFC2833.

9. The method of claim 1 , wherein the fixed packet network comprises a data over cable network.

10. The method of claim 1 , wherein the fixed packet network comprises a cellular network.

11. One or more non-transitory computer readable media having instructions operable to cause one or more processors to perform the operations comprising:

sending a first session request through a fixed packet network to a communications server, wherein the first session request is used to establish a first communication session between a VoIP device and a first peer device;

sending a request to place the first communication session between the VoIP device and the first peer device on hold, wherein the request comprises a SIP Invite or a SIP INFO message; and

while the first communication session between the VoIP device and the first peer device is maintained in an on hold condition:

receiving at the VoIP device an indication message from the communications server indicating that the communications server is ready to receive DTMF signals to initiate a second communication session between the VoIP device and a second peer device; and

sending a second session request, wherein the second session request comprises one or more DTMF signals, the one or more DTMF signals comprising information that is used to initiate the second communication session between the VoIP device and the second peer device.

12. The one or more non-transitory computer readable media of claim 11 , wherein the VoIP device is operable to communicate through a fixed packet network, and also through a cellular network.

13. The one or more non-transitory computer readable media of claim 11 , wherein the first session request comprises the SIP Invite message.

14. The one or more non-transitory computer readable media of claim 11 , wherein the request to place the first session between the VoIP device and the first peer device on hold comprises the SIP INFO message.

15. The one or more non-transitory computer readable media of claim 11 , wherein the DTMF signal comprises the number of the second peer device.

16. The one or more non-transitory computer readable media of claim 11 , wherein the DTMF information is carried using RFC2833.

17. A communications server comprising:

one or more processors configured to establish a first session between a VoIP device and a first peer device in response to receiving a first session request from a VoIP device through a fixed packet network;

an input/output interface, coupled to the one or more processors to be used to receive a request from the VoIP device to place the first session between the VoIP device and the first peer device in an on-hold condition, wherein the request comprises a SIP Invite or a SIP INFO message;

the one or more processors further configured to place the first session in an on-hold condition;

while the first session is in an on-hold condition:

output an indication message to the VoIP device, the indication message indicating to the VoIP device that the communications server is ready to receive DTMF signals; and

receive a second session request from the VoIP device, wherein the second session request comprises one or more DTMF signals, the one or more DTMF signals comprising information for establishing a second session between the VoIP device and a second peer device; and

the one or more processors further configured to establish a conference call between the VoIP device, the first peer device, and the second peer device.

18. The communications server configured of claim 17 , wherein the first session request comprises the SIP Invite message.

19. The communications server configured of claim 17 , wherein the request to place the first session between the VoIP device and the first peer device in an on-hold condition comprises the SIP INFO message.

20. The communications server of claim 17 , wherein the DTMF signal comprises the number of the second peer device.