System and method for dispatch calling using personal telephone numbers
View Patent ↗A method and system for dispatch calling using personal telephone numbers (PTNs) are provided. In accordance with the method and system, when a dispatch user enters a PTN as part of a dispatch call initiation, the originating dispatch call controller recognizes that the dispatch call request includes a PTN. If the originating dispatch call controller does not have the target subscriber in its recent call record cache, the originating call controller determines which home location registers (HLRs) serve subscribers with the particular NPA and NXX of the PTN. The originating call controller sends a request for the UFMI of the target subscriber to each of the determined HLRs. When the originating call controller receives a response from one of the HLRs with the UFMI, the originating call controller completes the dispatch call using the received UFMI.
1. In an iDEN network, a method for dispatch calling using a personal telephone number (PTN), the method comprising the acts of:
receiving a dispatch call request with the PTN;
determining which home location registers serve subscribers associated with a portion of the PTN;
querying the determined home location registers for an Urban, Fleet Member ID (UFMI);
completing the dispatch call using a UFMI received from one of the determined home location registers,
wherein the act of determining which home location registers serve subscribers associated with the portion of the PTN comprises the acts of:
querying a recent call record cache and a visitor location record; and
performing a global title translation (GTT) lookup, based on the portion of the PTN, if the querying of the recent call record cache and the visitor location record do not indicate which home location registers serve subscribers associated with the portion of the PTN.
2. The method of claim 1 , wherein an error message is output, if the UFMI is not received from the determined home location registers.
3. The method of claim 2 , wherein the error message comprises one of “invalid entry” and “target not authorized.”
4. The method of claim 1 , further comprising:
entering the PTN in a subscriber table of the determined home location register.
5. The method of claim 1 , further comprising:
storing the PTN in a recent call record cache contained in a dispatch call controller.
6. The method of claim 1 , wherein the portion of the PTN comprises an area code and a prefix of the PTN.