Extending originating capabilities of a subscriber to devices in any telephony network

1. A method for providing access to call origination features contained in an internet protocol multimedia subsystem (IMS) for a subscriber of the IMS who originates a call request from customer premises equipment (CPE) outside of the IMS, the method comprising the steps of:

receiving the call request at a public service identity (PSI) server that resides within the IMS where the PSI server has a phone number to which the call request is routed;

retrieving by the PSI server an IMS internal desk number based on a number of the CPE received as part of the call request;

transmitting a first modified call request from the PSI server to a telephony application server (TAS) where the first modified call request identifies the IMS internal desk number as a request universal resource identity (RURI);

performing, by the TAS, call origination treatment as specified by the subscriber based on the first modified call request;

processing the first modified call request by the TAS to form a second modified call request in which the RURI is a number of a destination party and a P-asserted identity (PAID) is the IMS internal desk number such that the second modified call request appears as if it has been originally initiated from a phone within the IMS;

transmitting the second modified call request to a node in the IMS for further processing and ultimately termination at the destination party.

2. The method of claim 1 where the first modified call request identifies the number of the CPE as the PAID.

3. The method of claim 1 further comprising generating the call request at the CPE in accordance with a hot line feature where the call request contains an RURI as the number of the PSI, the PAID is the number of the CPE, and the number of a destination party is also included.

4. The method of claim 1 further comprising transmitting a prompt by the PSI server to the originating subscriber at the CPE for the number of the destination party, and receiving the number of the destination party as input by the originating subscriber on the CPE in response to the prompt.

5. A system configured to provide access to call origination features contained in an internet protocol multimedia subsystem (IMS) for a subscriber of the IMS who originates a call request from customer premises equipment (CPE) outside of the IMS, the system comprising:

a public service identity (PSI) server that resides within the IMS where the PSI server has a phone number to which the call request is routed, the PSI server configured to:

receive the call request;

retrieve an IMS internal desk number based on a number of the CPE received as part of the call request; and

transmit a first modified call request to a telephony application server (TAS) where the first modified call request identifies the IMS internal desk number as a request universal resource identity (RURI); and

the TAS configured to:

provide call origination treatment as specified by the subscriber based on the first modified call request;

generate, based on the first modified call request, a second modified call request in which the RURI is a number of a destination party and a P-asserted identity (PAID) is the IMS internal desk number such that the second modified call request appears as if it was originally initiated from a phone within the IMS; and

forward the second modified call request to a node in the IMS for further processing and ultimately termination at the destination party.

6. The system of claim 5 where the PSI server is further configured to generate the first modified call request that identifies the number of the CPE as the PAID.

7. The system of claim 5 where the call request is generated in accordance with a hot line feature and where the call request contains an RURI as the number of the PSI, the PAID is the number of the CPE, and the number of a destination party is also included.

8. The system of claim 5 where the PSI server is further configured to:

transmit a prompt to the originating subscriber at the CPE for the number of the destination party; and

receive the number of the destination party as input by the originating subscriber on the CPE in response to the prompt.

9. A method for providing access to call origination features contained in an internet protocol multimedia subsystem (IMS) for a subscriber of the IMS who originates a call request from a telephone outside of the IMS to a call termination party, the method implemented by the IMS comprising the steps of:

receiving the call request at an IMS server where the IMS server has a phone number to which the call request is routed;

retrieving an internal IMS number based on a number of the telephone received as part of the call request;

performing, as specified by the subscriber associated with the internal IMS number, origination of the call using an IMS supported call origination service where the call origination service is one of speed dialing, three-way conference calling, and extension-only dialing of a termination telephone internally within the IMS;

generating another call request that indicates it was originally initiated within the IMS and having a destination of the call termination party.

10. The method of claim 9 further comprising:

the retrieving including identifying the internal IMS number as a request universal resource identity (RURI); and

the generating including generating the another call request in which the RURI is a number of the call termination party and a P-asserted identity (PAID) is the internal IMS number such that the another call request appears as if it has been originally initiated within the IMS, the another call request seeking call termination at the call termination party.

11. The method of claim 10 where the number of the telephone is identified as the PAID.

12. The method of claim 10 further comprising the call request being received from the telephone in accordance with a hot line feature where the call request contains an RURI as the number of a public service identity (PSI), the PAID is the number of the telephone, and the number of the call termination party is also included.

13. The method of claim 10 further comprising transmitting a prompt by the IMS server to the originating subscriber at the telephone for the number of the call termination party, and receiving the number of the call termination party as input by the originating subscriber on the telephone in response to the prompt.

14. The method of claim 9 wherein the call request is an inbound call to the IMS and the another call request is an outbound call from the IMS.

15. The method of claim 1 wherein the first modified call request is an inbound call to the IMS and the second modified call request is an outbound call from the IMS.

16. The system of claim 5 wherein the TAS is further configured to treat the first modified call request as an inbound call to the IMS and the second modified call request as an outbound call from the IMS.

17. The method of claim 9 wherein the step of performing the call origination feature comprises providing access to the call origination telephone outside of the IMS to any IMS supported call origination service normally provided to telephones internally within the IMS.

18. The method of claim 1 wherein the step of performing call origination treatment comprises providing access to the CPE outside of the IMS to any IMS supported call origination service normally provided to telephones internally within the IMS.